49 CFR Part 177 — Carriage by Public Highway

PART 177—CARRIAGE BY PUBLIC HIGHWAY Authority: 49 U.S.C. 5101-5128; sec. 112 of Pub. L. 103-311, 108 Stat. 1673, 1676 (1994); sec. 32509 of Pub. L. 112-141, 126 Stat. 405, 805 (2012); 49 CFR 1.81 and 1.97. Source: 29 FR 18795, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967. Subpart A—General Information and Regulations § 177.800 Purpose and scope of this part and responsibility for compliance and training. (a) Purpose and scope. (b) Responsibility for compliance. (c) Responsibility for training. (d) No unnecessary delay in movement of shipments. [Amdt. 177-79, 57 FR 20954, May 15, 1992, as amended by Amdt.177-86, 61 FR 18933, Apr. 29, 1996] § 177.801 Unacceptable hazardous materials shipments. No person may accept for transportation or transport by motor vehicle a forbidden material or hazardous material that is not prepared in accordance with the requirements of this subchapter. [Amdt. 177-87, 61 FR 27175, May 30, 1996] § 177.802 Inspection. Records, equipment, packagings and containers under the control of a motor carrier, insofar as they affect safety in transportation of hazardous materials by motor vehicle, must be made available for examination and inspection by a duly authorized representative of the Department. [Amdt. 177-71, 54 FR 25015, June 12, 1989] § 177.804 Compliance with Federal Motor Carrier Safety Regulations. (a) General. (b) Additional prohibitions. (1) Must comply with the safe clearance requirements for highway-rail grade crossings in § 392.12 of this title; (2) May not engage in, allow, or require texting while driving, in accordance with § 392.80 of this title; and (3) May not engage in, allow, or require the use of a hand-held mobile telephone while driving, in accordance with § 392.82 of this title. [78 FR 58923, Sept. 25, 2013] § 177.810 Vehicular tunnels. Except as regards Class 7 (radioactive) materials, nothing contained in parts 170-189 of this subchapter shall be so construed as to nullify or supersede regulations established and published under authority of State statute or municipal ordinance regarding the kind, character, or quantity of any hazardous material permitted by such regulations to be transported through any urban vehicular tunnel used for mass transportation. [Amdt. 177-52, 46 FR 5316, Jan. 19, 1981, as amended by Amdt. 177-78, 55 FR 52710, Dec. 21, 1990; 62 FR 51561, Oct. 1, 1997] § 177.816 Driver training. (a) In addition to the training requirements of § 177.800, no carrier may transport, or cause to be transported, a hazardous material unless each hazmat employee who will operate a motor vehicle has been trained in the applicable requirements of 49 CFR parts 390 through 397 and the procedures necessary for the safe operation of that motor vehicle. Driver training shall include the following subjects: (1) Pre-trip safety inspection; (2) Use of vehicle controls and equipment, including operation of emergency equipment; (3) Operation of vehicle, including turning, backing, braking, parking, handling, and vehicle characteristics including those that affect vehicle stability, such as effects of braking and curves, effects of speed on vehicle control, dangers associated with maneuvering through curves, dangers associated with weather or road conditions that a driver may experience (e.g., blizzards, mountainous terrain, high winds), and high center of gravity; (4) Procedures for maneuvering tunnels, bridges, and railroad crossings; (5) Requirements pertaining to attendance of vehicles, parking, smoking, routing, and incident reporting; and (6) Loading and unloading of materials, including— (i) Compatibility and segregation of cargo in a mixed load; (ii) Package handling methods; and (iii) Load securement. (b) Specialized requirements for cargo tanks and portable tanks. (1) Operation of emergency control features of the cargo tank or portable tank; (2) Special vehicle handling characteristics, including: high center of gravity, fluid-load subject to surge, effects of fluid-load surge on braking, characteristic differences in stability among baffled, unbaffled, and multi-compartmented tanks; and effects of partial loads on vehicle stability; (3) Loading and unloading procedures; (4) The properties and hazards of the material transported; and (5) Retest and inspection requirements for cargo tanks. (c) The training required by paragraphs (a) and (b) of this section may be satisfied by compliance with the current requirements for a Commercial Driver's License (CDL) with a tank vehicle or hazardous materials endorsement. (d) Training required by paragraph (b) of this section must conform to the requirements of § 172.704 of this subchapter with respect to frequency and recordkeeping. [Amdt. 177-79, 57 FR 20954, May 15, 1992, as amended by Amdt. 177-79, 58 FR 5852, Jan. 22, 1993] § 177.817 Shipping papers. (a) General requirements. (b) Shipper certification. (c) Requirements when interlining with carriers by rail. (1) A description of the freight container or transport vehicle; and (2) The kind of placard affixed to the freight container or transport vehicle. (d) Applicability. (e) Shipping paper accessibility—accident or inspection. (1) Clearly distinguish the shipping paper, if it is carried with other shipping papers or other papers of any kind, by either distinctively tabbing it or by having it appear first; and (2) Store the shipping paper as follows: (i) When the driver is at the vehicle's controls, the shipping paper shall be: (A) Within his immediate reach while he is restrained by the lap belt; and (B) either readily visible to a person entering the driver's compartment or in a holder which is mounted to the inside of the door on the driver's side of the vehicle. (ii) When the driver is not at the vehicle's controls, the shipping paper shall be: (A) In a holder which is mounted to the inside of the door on the driver's side of the vehicle; or (B) on the driver's seat in the vehicle. (f) Retention of shipping papers. [Amdt. 177-35, 41 FR 16130, Apr. 15, 1976, as amended by Amdt. 177-35A, 41 FR 40691, Sept. 20, 1976; Amdt. 177-48, 45 FR 47670, Nov. 10, 1980; Amdt. 177-65, 50 FR 11055, Mar. 19, 1985; Amdt. 177-72, 53 FR 17160, May 13, 1988; 67 FR 46128, July 12, 2002; 67 FR 66574, Nov. 1, 2002; 68 FR 19277, Apr. 18, 2003; 68 FR 57633, Oct. 6, 2003; 70 FR 73165, Dec. 9, 2005; 87 FR 79784, Dec. 27, 2022] § 177.823 Movement of motor vehicles in emergency situations. (a) A carrier may not move a transport vehicle containing a hazardous material unless the vehicle is marked and placarded in accordance with part 172 or as authorized in § 171.12a of this subchapter, or unless, in an emergency: (1) The vehicle is escorted by a representative of a state or local government; (2) The carrier has permission from the Department; or (3) Movement of the transport vehicle is necessary to protect life or property. (b) Disposition of contents of cargo tank when unsafe to continue. (c) Movement of leaking cargo tanks. [Amdt. 177-35, 41 FR 16130, Apr. 15, 1976, as amended by Amdt. 177-67, 50 FR 41521, Oct. 11, 1985; Amdt. 177-86, 61 FR 18933, Apr. 29, 1996] Subpart B—Loading and Unloading Note: For prohibited loading and storage of hazardous materials, see § 177.848. § 177.834 General requirements. (a) Packages secured in a motor vehicle. (b) Each package containing a hazardous material bearing package orientation markings prescribed in § 172.312 of this subchapter must be loaded on a transport vehicle or within a freight container in accordance with such markings and must remain in the correct position indicated by the markings during transportation. (c) No smoking while loading or unloading. (d) Keep fire away, loading and unloading. (e) Handbrake set while loading and unloading. (f) Use of tools, loading and unloading. (g) [Reserved] (h) Precautions concerning containers in transit; fueling road units. (1) Drums. (i) Product transfer must be through pumps mounted on the motor vehicle or with an injection system indirectly mounted on a motor vehicle; (ii) The drums must be attended at all times during unloading operations by a qualified person. For the purposes of this requirement, “attended” and “qualified” have the meanings described in paragraphs (i)(3) and (i)(4) of this section, respectively; (iii) Hoses shall not be attached to container outlets during transportation; (iv) Drums shall not be manifolded together during transportation; (v) Each reused drum must meet the requirements prescribed in § 173.28 or an active special permit, as applicable; and (vi) For Class 3 materials, see § 177.837(b). (2) IBCs and DOT specification 57 portable tanks. (i) Transportation is limited to private or contract motor vehicle; (ii) IBC design types authorized are UN 31A, 31B, 31N, 31H1, 31H2, and 31HZ1; (iii) If the IBC or portable tank is pressurized, it must be equipped with a pressure relief device set to open at not higher than two-thirds of the test pressure or 9 psig for a metal IBC; (iv) Except for hypochlorite solutions and fluorosilicic acid, two or more materials may not be loaded on the same vehicle if any mixture of the materials would cause an unsafe condition. Hypochlorite solutions and fluorosilicic acid may be loaded on the same vehicle and transported in separate IBCs provided— (A) No more than two IBCs are transported on a motor vehicle; (B) Each IBC has a capacity not exceeding 1703 L (450 gallons); (C) The materials shall not be discharged at the same time; and (D) The hazardous materials are used for water treatment purposes only. (v) Packagings shall not be manifolded together or have discharge outlets permanently connected to any part of the vehicle, including its discharge system. Hoses shall not remain attached to IBCs or portable tanks ( e.g., (vi) The packagings must be attended at all times during unloading operations by a qualified person. For the purposes of this requirement, “attended” and “qualified” have the meanings described in paragraphs (i)(3) and (4) of this section, respectively; (vii) Each IBC or DOT specification 57 portable tank must be discharged by— (A) Using a mechanical pump with a positive means of stopping the flow of liquid from the pump; (B) Gravity; or (C) Pressurizing the IBC or portable tank. (viii) Before starting each transfer of product to a receiving system, the person performing that function must determine that each component of the discharge system (including the hose) is of sound quality, free of leaks, and that connections are secure. A hose or associated equipment that shows signs of leakage, significant bulging, or other defects may not be used; (ix) Packages shall not be filled or refilled while on a motor vehicle unless filled or refilled on the private property of the shipper, filler, or refiller. Prior to refilling, each IBC and its service equipment must be visually inspected in accordance with the provisions of §§ 173.35(b) and 180.352 and each DOT specification 57 portable tank and its service equipment must be visually inspected in accordance with the provisions of § 180.605; (x) Prior to reentering transportation, all hazardous materials must be purged from the pump, if equipped, the piping, and the discharge hose, as far as practicable; or all free-flowing hazardous material must be removed from the pump, if equipped, piping and the discharge hose in accordance with § 173.33(e). Residue remaining in these devices after product draining is not subject to this requirement provided these devices are capped and secured during transportation; (xi) If the IBC or portable tank is unloaded using a pump, or if it is pressurized for unloading, prior to using a new or repaired transfer hose assembly (hose and associated fittings), the hose assembly must be subjected to a pressure test. The pressure test must be performed at no less than the pressure the hose is expected to be subjected to during product transfer. This test must be performed with all hose and hose fittings arranged in the configuration to be employed during transfer operations. Burst pressure must be at least four times the service pressure of the pump; and (xii) For Class 3 materials, see § 177.837(b). (i) Attendance requirements Loading. (2) Unloading. (i) The carrier's obligation for transporting the materials is fulfilled; (ii) The cargo tank has been placed upon the consignee's premises; and (iii) The motive power has been removed from the cargo tank and removed from the premises. (3) A qualified person “attends” the loading or unloading of a cargo tank only if, throughout the process: (i) Except for unloading operations subject to §§ 177.837(d) and 177.840(p) and (q), the qualified person is within 7.62 m (25 feet) of the cargo tank. The qualified person attending the unloading of a cargo tank must be alert and have an unobstructed view of the cargo tank and delivery hose to the maximum extent practicable during the unloading operation; or (ii) The qualified person observes all loading or unloading operations by means of video cameras and monitors or instrumentation and signaling systems such as sensors, alarms, and electronic surveillance equipment located at a remote control station, and the loading or unloading system is equipped as follows: (A) For a video monitoring system used to meet the attendance requirement, the camera must be mounted so as to provide an unobstructed view of all equipment involved in the loading or unloading operations, including all valves, hoses, domes, and pressure relief devices; (B) For an instrumentation and signaling system used to meet the attendance requirement, the system must provide a surveillance capability at least equal to that of a human observer; (C) Upon loss of video monitoring capability or instrumentation and signaling systems, loading or unloading operations must be immediately terminated; (D) Shut-off valves operable from the remote control station must be provided; (E) In the event of a remote system failure, a qualified person must immediately resume attending the loading or unloading of the cargo tank as provided in paragraph (i)(3)(i) of this section; (F) A containment area must be provided capable of holding the contents of as many cargo tank motor vehicles as might be loaded at any single time; and (G) A qualified person must personally conduct a visual inspection of each cargo tank motor vehicle after it is loaded, prior to departure, for any damage that may have occurred during loading; or (iii) Hoses used in the loading or unloading operations are equipped with cable-connected wedges, plungers, or flapper valves located at each end of the hose, able to stop the flow of product from both the source and the receiving tank within one second without human intervention in the event of a hose rupture, disconnection, or separation. (A) Prior to each use, each hose must be inspected to ensure that it is of sound quality, without defects detectable through visual observation; and (B) The loading or unloading operations must be physically inspected by a qualified person at least once every sixty (60) minutes. (4) A person is “qualified” if he has been made aware of the nature of the hazardous material which is to be loaded or unloaded, has been instructed on the procedures to be followed in emergencies, and except for persons observing loading or unloading operations by means of video cameras and monitors or instrumentation and signaling systems such as sensors, alarms, and electronic surveillance equipment located at a remote control station and persons inspecting hoses in accordance with paragraph (i)(3)(iii) of this section, is authorized to move the cargo tank, and has the means to do so. (j) Except for a cargo tank conforming to § 173.29(b)(2) of this subchapter, a person may not drive a cargo tank motor vehicle containing a hazardous material regardless of quantity unless: (1) All manhole closures are closed and secured; and (2) All valves and other closures in liquid discharge systems are closed and free of leaks, except external emergency self-closing valves on MC 338 cargo tanks containing the residue of cryogenic liquids may remain either open or closed during transit. (k) [Reserved] (l) Use of cargo heaters when transporting certain hazardous material. (1) When transporting Class 1 (explosive) materials. (2) When transporting certain flammable material Use of combustion cargo heaters. (A) The combustion cargo heater is powered by diesel fuel or propane and each of the following requirements are met: ( 1 ( 2 ( 3 ( 4 ( 5 ( 6 ( 7 ( 8 ( 9 (B) The combustion cargo heater is a catalytic heater and each of the following requirements are met: ( 1 ( 2 ( 3 ( 4 “MEETS DOT REQUIREMENTS FOR CATALYTIC HEATERS USED WITH FLAMMABLE LIQUID AND GAS.” ( 5 DO NOT LOAD INTO OR USE IN CARGO COMPARTMENTS CONTAINING FLAMMABLE LIQUID OR GAS IF FLAME IS VISIBLE ON CATALYST OR IN HEATER.” ( 6 Heater requirements under § 393.77 of this title are complied with. (ii) [Reserved] (iii) Restrictions on automatic cargo-space-heating temperature control devices. (A) Use restrictions. ( 1 ( 2 ( 3 ( 4 ( 5 (B) Protection against use. ( 1 ( 2 (m) Tanks constructed and maintained in compliance with Spec. 106A or 110A (§§ 179.300, 179.301 of this subchapter) that are authorized for the shipment of hazardous materials by highway in part 173 of this subchapter must be carried in accordance with the following requirements: (1) Tanks must be securely chocked or clamped on vehicles to prevent any shifting. (2) Equipment suitable for handling a tank must be provided at any point where a tank is to be loaded upon or removed from a vehicle. (3) No more than two cargo carrying vehicles may be in the same combination of vehicles. (4) Compliance with §§ 174.200 and 174.204 of this subchapter for combination rail freight, highway shipments and for trailer-on-flat-car service is required. (n) Specification 56, 57, IM 101, and IM 102 portable tanks, when loaded, may not be stacked on each other nor placed under other freight during transportation by motor vehicle. (o) Unloading of IM and UN portable tanks. (1) The unloading operation must be attended by a qualified person in accordance with the requirements in paragraph (i) of this section. The person performing unloading functions must be trained in handling emergencies that may occur during the unloading operation. (2) Prior to unloading, the operator of the vehicle on which the portable tank is transported must ascertain that the conditions of this paragraph (o) are met. (3) An IM or UN portable tank equipped with a bottom outlet as authorized in Column (7) of the § 172.101 Table of this subchapter by assignment of a T Code in the appropriate proper shipping name entry, and that contains a liquid hazardous material of Class 3, PG I or II, or PG III with a flash point of less than 100 °F (38 °C); Division 5.1, PG I or II; or Division 6.1, PG I or II, must conform to the outlet requirements in § 178.275(d)(3) of this subchapter. [29 FR 18795, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register www.govinfo.gov. § 177.835 Class 1 (explosive) materials. (See also § 177.834 (a) to (j).) (a) Engine stopped. (b) Care in loading, unloading, or other handling of Class 1 (explosive) materials. (1) Whenever tarpaulins are used for covering Class 1 (explosive) materials, they shall be secured by means of rope, wire, or other equally efficient tie downs. Class 1 (explosive) materials placards or markings required by § 177.823 shall be secured, in the appropriate locations, directly to the equipment transporting the Class 1 (explosive) materials. If the vehicle is provided with placard boards, the placards must be applied to these boards. (2) [Reserved] (c) Class 1 (explosive) materials on vehicles in combination. (1) More than two cargo carrying vehicles are in the combination; (2) Any full trailer in the combination has a wheel base of less than 184 inches; (3) Any vehicle in the combination is a cargo tank which is required to be marked or placarded under § 177.823; or (4) The other vehicle in the combination contains any: (i) Substances, explosive, n.o.s., Division 1.1A (explosive) material (Initiating explosive), (ii) Packages of Class 7 (radioactive) materials bearing “Yellow III” labels, (iii) Division 2.3, Hazard Zone A or Hazard Zone B materials or Division 6.1, PG I, Hazard Zone A materials, or (iv) Hazardous materials in a portable tank or a DOT specification 106A or 110A tank. (d) Multipurpose bulk trucks. (e) No sharp projections inside body of vehicles. (f) Class 1 (explosive) materials vehicles, floors tight and lined. (g) No detonator assembly or booster with detonator may be transported on the same motor vehicle with any Division 1.1, 1.2 or 1.3 material (except other detonator assemblies, boosters with detonators or detonators), detonating cord Division 1.4 material or Division 1.5 material. No detonator may be transported on the same motor vehicle with any Division 1.1, 1.2 or 1.3 material (except other detonators, detonator assemblies or boosters with detonators), detonating cord Division 1.4 material or Division 1.5 material unless— (1) It is packed in a specification MC 201 (§ 178.318 of this subchapter) container; or (2) The package conforms with requirements prescribed in § 173.62 of this subchapter, and its use is restricted to instances when— (i) There is no Division 1.1, 1.2, 1.3 or 1.5 material loaded on the motor vehicle; and (ii) A separation of 61 cm (24 inches) is maintained between each package of detonators and each package of detonating cord; or (3) It is packed and loaded in accordance with a method approved by the Associate Administrator. One approved method requires that— (i) The detonators are in packagings as prescribed in § 173.63 of this subchapter which in turn are loaded into suitable containers or separate compartments; and (ii) That both the detonators and the container or compartment meet the requirements of the IME Standard 22 (IBR, see § 171.7 of this subchapter). (h) Lading within body or covered tailgate closed. (i) Class 1 (explosive) materials to be protected against damage by other lading. (j) Transfer of Class 1 (explosive) materials en route. (k) Attendance of Class 1 (explosive) materials. [29 FR 18795, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register www.govinfo.gov. § 177.837 Class 3 (flammable liquid) materials. (See also § 177.834 (a) to (j).) (a) Engine stopped. (b) Bonding and grounding containers other than cargo tanks prior to and during transfer of lading. (c) Bonding and grounding cargo tanks before and during transfer of lading. (2) When a cargo tank is loaded or unloaded through a vapor-tight (not open hole) top or bottom connection, so that there is no release of vapor at a point where a spark could occur, bonding or grounding is not required. Contact of the closed connection must be made before flow starts and must not be broken until after the flow is completed. (3) Bonding or grounding is not required when a cargo tank is unloaded through a nonvapor-tight connection into a stationary tank provided the metallic filling connection is maintained in contact with the filling hole. (d) Unloading combustible liquids. [29 FR 18795, Dec. 29, 1964] Editorial Note: For Federal Register www.govinfo.gov. § 177.838 Class 4 (flammable solid) materials, Class 5 (oxidizing) materials, and Division 4.2 (self-heating and pyrophoric liquid) materials. (See also § 177.834 (a) to (j).) (a) Lading within body or covered; tailgate closed; pick-up and delivery. Provided, however, (b) Articles to be kept dry. (c) Lading ventilation, precautions against spontaneous combustion. (d)-(e) [Reserved] (f) Nitrates, except ammonium nitrate having organic coating, must be loaded in closed or open type motor vehicles, which must be swept clean and be free of any projections capable of injuring bags when so packaged. When shipped in open type motor vehicles, the lading must be suitably covered. Ammonium nitrate having organic coating must not be loaded in all-metal vehicles, other than those made of aluminum or aluminum alloys of the closed type. (g) A motor vehicle may only contain 45.4 kg (100 pounds) or less net mass of material described as “Smokeless powder for small arms, Division 4.1” or “Black powder for small arms, Division 4.1.” (h) Division 4.2 (pyrophoric liquid) materials in cylinders. (i) Division 4.2 (self-heating liquid) material. Notwithstanding the segregation requirements of § 177.848(d), the following Division 4.2 (self-heating) materials may be transported on the same transport vehicle with Class 8 (corrosive) materials. The hazardous materials must be palletized with a minimum height of 100 mm (4 inches) off the floor of the vehicle, and the self-heating material must be separated from the corrosive material by a minimum horizontal distance of 1.2 m (4 feet). (1) Sodium hydrosulfite or (2) Thiourea dioxide, UN3341, in PG II or III packaged in UN 1G fiber drums meeting packing group II performance requirements of subpart M of part 178 of this subchapter. (3) Self-heating, solid, organic, n.o.s., UN3088, in PG II or III packaged in UN 1G fiber drums meeting the Packing Group II performance level requirements of subpart M of part 178 of this subchapter. [29 FR 18795, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register www.govinfo.gov. § 177.839 Class 8 (corrosive) materials. (See also § 177.834(a) through (j).) (a) Nitric acid. (b) Storage batteries. [Amdt. 177-87, 61 FR 27175, May 30, 1996] § 177.840 Class 2 (gases) materials. (See also § 177.834 (a) to (j).) (a) Floors or platforms essentially flat. (1) Cylinders. (2) Cylinders for hydrogen, cryogenic liquid. (i) The vehicle must have an open body equipped with a suitable rack or support having a means to hold the cylinder upright when subjected to an acceleration of 2 “g” in any horizontal direction; (ii) The combined total of the hydrogen venting rates, as marked, on the cylinders transported on one motor vehicle may not exceed 60 SCF per hour; (iii) The vehicle may not enter a tunnel; and (iv) Highway transportation is limited to private and contract carriage and to direct movement from point of origin to destination. (3) Cylinders containing material classed as Division 2.3, Hazard Zone A. (A) The Division 2.3, Hazard Zone A material must be packaged as authorized by this subchapter. In addition, each package must be must be placed in a plastic bag which is taped closed and then overpacked in a UN 1A2 steel drum tested and marked for a PG II or higher performance level with insulation material inside to protect the cylinders from fire. The outside of the overpack must be marked with an indication that the inner packagings conform to the prescribed specifications. (B) A Division 2.1 material requiring strong non-bulk outer packagings in accordance with § 173.301(a)(9) of this subchapter must be overpacked in a UN 1A2 steel or 1H2 plastic drum tested and marked for a PG II or higher performance level. The outside of the overpack must be marked with an indication that the inner packagings conform to the prescribed specifications. (C) Packages containing Division 2.3 Hazard Zone A material must be separated within the transport vehicle from packages containing Division 2.1, Class 3, Class 4, Class 5, and Class 8 materials by a minimum horizontal distance of 1.2 m (4 feet). In addition, all steel or plastic overpacks containing packages of Division 2.3, Hazard Zone A or Division 2.1 material must be placed on pallets within the transport vehicle. (ii) Notwithstanding the segregation requirements of § 177.848(d), Division 2.3, Hazard Zone A material may be transported on the same transport vehicle with non-bulk packagings and IBCs meeting a UN performance standard containing only the residue of Division 2.1, 4.3, 5.1, and Class 3 and 8 materials if all of the following requirements are met: (A) The materials are transported in enclosed trailers equipped with inlet and outlet vent openings with a minimum total area of one square foot per 1,000 cubic feet of trailer volume. Electrical systems within the trailer's interior must be non-sparking or explosion proof. (B) Cylinders must be transported in an upright position and securely restrained within the trailer, or loaded into racks, secured to pallets, or packed in wooden or fiberboard boxes or crates to prevent the cylinders from shifting or overturning within the motor vehicle under normal transportation conditions. If cylinders are secured to a pallet, the pallet must be designed to transport 1,590 kg (3,500 lbs.) per pallet and the cylinders must be secured within the pallet by a web strap rated at 4,545 kg (10,000 lbs.). (C) A cylinder containing Division 2.3 Hazard Zone A materials must be separated from non-bulk packagings and IBCs meeting a UN performance standard containing the residue of materials in Division 2.1, 4.3, or 5.1, or Class 3 or 8 by a minimum horizontal distance of 3 m (10 feet). The maximum gross weight of Division 2.3 Hazard Zone A material carried on one vehicle must not exceed 3,636 kg (8,000 lbs.). (D) Motor carriers must have a satisfactory safety rating as prescribed in 49 CFR part 385. (4) Cylinders for acetylene. (b) Portable tank containers containing Class 2 (gases) materials shall be loaded on motor vehicles only as follows: (1) Onto a flat floor or platform of a motor vehicle. (2) Onto a suitable frame of a motor vehicle. (3) In either such case, such containers shall be safely and securely blocked or held down to prevent shifting relative to each other or to the supporting structure when in transit, particularly during sudden starts and stops and changes of direction of the vehicle. (4) Requirements of paragraphs (1) and (2) of this paragraph (b) shall not be construed as prohibiting stacking of containers provided the provisions of paragraph (3) of this paragraph (b) are fully complied with. (c) [Reserved] (d) Engine to be stopped in cargo tank motor vehicles, except for transfer pump. (e) Chlorine cargo tank motor vehicles shall be shipped only when equipped: (1) With a gas mask of a type approved by the National Institute of Occupational Safety and Health (NIOSH) Pittsburgh Research Center, U.S. Department of Health and Human Services for chlorine service; and (2) With an emergency kit for controlling leaks in fittings on the dome cover plate. (f) A cargo tank motor vehicle used for transportation of chlorine may not be moved, coupled or uncoupled, when any loading or unloading connections are attached to the vehicle, nor may it be left without the power unit attached unless the vehicle is chocked or equivalent means are provided to prevent motion. For additional requirements, see § 173.315(o) of this subchapter. (g) Each liquid discharge valve on a cargo tank motor vehicle, other than an engine fuel line valve, must be closed during transportation except during loading and unloading. (h) The driver of a motor vehicle transporting a Division 2.1 (flammable gas) material that is a cryogenic liquid in a package exceeding 450 L (119 gallons) of water capacity shall avoid unnecessary delays during transportation. If unforeseen conditions cause an excessive pressure rise, the driver shall manually vent the tank at a remote and safe location. For each shipment, the driver shall make a written record of the cargo tank pressure and ambient (outside) temperature: (1) At the start of each trip, (2) Immediately before and after any manual venting, (3) At least once every five hours, and (4) At the destination point. (i) No person may transport a Division 2.1 (flammable gas) material that is a cryogenic liquid in a cargo tank motor vehicle unless the pressure of the lading is equal to or less than that used to determine the marked rated holding time (MRHT) and the one-way travel time (OWTT), marked on the cargo tank in conformance with § 173.318(g) of this subchapter, is equal to or greater than the elapsed time between the start and termination of travel. This prohibition does not apply if, prior to expiration of the OWTT, the cargo tank is brought to full equilibration as specified in paragraph (j) of this section. (j) Full equilibration of a cargo tank transporting a Division 2.1 (flammable gas) material that is a cryogenic liquid may only be done at a facility that loads or unloads a Division 2.1 (flammable gas) material that is a cryogenic liquid and must be performed and verified as follows: (1) The temperature and pressure of the liquid must be reduced by a manually controlled release of vapor; and (2) The pressure in the cargo tank must be measured at least ten minutes after the manual release is terminated. (k) A carrier of carbon monoxide, cryogenic liquid must provide each driver with a self-contained air breathing apparatus that is approved by the National Institute of Occupational Safety and Health; for example, Mine Safety Appliance Co., Model 401, catalog number 461704. (l) Operating procedure. (m) Cargo tank motor vehicle safety check. (n) Emergency shut down. (o) Daily test of off-truck remote shut-off activation device. (p) Unloading procedures for liquefied petroleum gas and anhydrous ammonia in metered delivery service. (1) For a cargo tank with a capacity of 13,247.5 L (3,500 water gallons) or less, excluding delivery hose and piping, the qualified person attending the unloading operation must remain within 45.72 meters (150 feet) of the cargo tank and 7.62 meters (25 feet) of the delivery hose and must observe both the cargo tank and the receiving container at least once every five minutes when the internal self-closing stop valve is open during unloading operations that take more than five minutes to complete. (2) For a cargo tank with a capacity greater than 13,247.5 L (3,500 water gallons), excluding delivery hose and piping, the qualified person attending the unloading operation must remain within 45.72 m (150 feet) of the cargo tank and 7.62 m (25 feet) of the delivery hose when the internal self-closing stop valve is open. (i) Except as provided in paragraph (p)(2)(ii) of this section, the qualified person attending the unloading operation must have an unobstructed view of the cargo tank and delivery hose to the maximum extent practicable, except during short periods when it is necessary to activate controls or monitor the receiving container. (ii) For deliveries where the qualified person attending the unloading operation cannot maintain an unobstructed view of the cargo tank, when the internal self-closing stop valve is open, the qualified person must observe both the cargo tank and the receiving container at least once every five minutes during unloading operations that take more than five minutes to complete. In addition, by the compliance dates specified in §§ 173.315(n)(5) and 180.405(m)(3) of this subchapter, the cargo tank motor vehicle must have an emergency discharge control capability that meets the requirements of § 173.315(n)(2) or § 173.315(n)(4) of this subchapter. (q) Unloading procedures for liquefied petroleum gas and anhydrous ammonia in other than metered delivery service. (1) The qualified person attending the unloading operation must remain within 7.62 m (25 feet) of the cargo tank when the internal self-closing stop valve is open. (2) The qualified person attending the unloading operation must have an unobstructed view of the cargo tank and delivery hose to the maximum extent practicable, except during short periods when it is necessary to activate controls or monitor the receiving container. (r) Unloading using facility-provided hoses. (1) The qualified person monitoring unloading must visually examine the facility hose assembly for obvious defects prior to its use in the unloading operation. (2) The qualified person monitoring unloading must remain within arm's reach of the mechanical means of closure for the internal self-closing stop valve when the internal self-closing stop valve is open except for short periods when it is necessary to activate controls or monitor the receiving container. For chlorine cargo tank motor vehicles, the qualified person must remain within arm's reach of a means to stop the flow of product except for short periods when it is necessary to activate controls or monitor the receiving container. (3) If the facility hose is equipped with a passive means to shut off the flow of product that conforms to and is maintained to the performance standard in § 173.315(n)(2) of this subchapter, the qualified person may attend the unloading operation in accordance with the attendance requirements prescribed for the material being unloaded in § 177.834 of this section. (s) Off-truck remote shut-off activation device. (t) Unloading without appropriate emergency discharge control equipment. (u) Unloading of chlorine cargo tank motor vehicles. (Approved by the Office of Management and Budget under control number 2137-0542) [29 FR 18795, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register www.govinfo.gov. § 177.841 Division 6.1 (poisonous) materials and Division 2.3 (poisonous gas) materials. (See also § 177.834 (a) to (j).) (a) Arsenical compounds in bulk. (b) [Reserved] (c) Division 2.3 (poisonous gas) or Division 6.1 (poisonous) materials. (d) [Reserved] (e) A motor carrier may not transport a package: (1) Except as provided in paragraph (e)(3) of this section, bearing or required to bear a POISON or POISON INHALATION HAZARD label or placard in the same motor vehicle with material that is marked as or known to be foodstuffs, feed or edible material intended for consumption by humans or animals unless the poisonous material is packaged in accordance with this subchapter and is: (i) Overpacked in a metal drum as specified in § 173.25(c) of this subchapter; or (ii) Loaded into a closed unit load device and the foodstuffs, feed, or other edible material are loaded into another closed unit load device; (2) Bearing or required to bear a POISON, POISON GAS or POISON INHALATION HAZARD label in the driver's compartment (including a sleeper berth) of a motor vehicle; or (3) Bearing a POISON label displaying the text “PG III,” or bearing a “PG III” mark adjacent to the POISON label, with materials marked as, or known to be, foodstuffs, feed or any other edible material intended for consumption by humans or animals, unless the package containing the Division 6.1, Packing Group III material is separated in a manner that, in the event of leakage from packages under conditions normally incident to transportation, commingling of hazardous materials with foodstuffs, feed or any other edible material would not occur. (f) Notwithstanding the segregation requirements of § 177.848(d), when transported by highway by private or contract motor carrier, Division 6.1 PG I, Hazard Zone A toxic-by-inhalation (TIH) materials meeting the definition of a hazardous waste as provided in § 171.8 of this subchapter, may be transported on the same transport vehicle with materials classed as Class 3, Class 4, Class 5, and Class 8. The Division 6.1 PG I, Hazard Zone A materials must be loaded on pallets and separated from the Class 3, Class 4, Class 5, and Class 8 materials by a minimum horizontal distance of 2.74 m (9 feet) when in conformance with the following: (1) The TIH materials are packaged in combination packagings as prescribed in § 173.226(c) of this subchapter. (2) The combination packages containing TIH materials must be: (i) Filled and packed by the offeror's hazmat employees; (ii) Be placed on pallets, when in a transport vehicle; and (iii) Separated from hazardous materials classed as Class 3, Class 8 or Divisions 4.1, 4.2, 4.3, 5.1, or 5.2 by a nine-foot (minimum distance) buffer zone, when in a transport vehicle. The buffer zone maybe established by: (A) A load lock; (B) Empty drums; (C) Drums containing hazardous materials (e.g., Class 9) that are compatible with materials in all other drums immediately around them; or (D) Drums containing non-hazardous materials that are compatible with materials in all other drums immediately around them. [29 FR 18795, Dec. 29, 1964] Editorial Note: For Federal Register www.govinfo.gov. § 177.842 Class 7 (radioactive) material. (a) The number of packages of Class 7 (radioactive) materials in any transport vehicle or in any single group in any storage location must be limited so that the total transport index number does not exceed 50. The total transport index of a group of packages and overpacks is determined by adding together the transport index number on the labels on the individual packages and overpacks in the group. This provision does not apply to exclusive use shipments described in §§ 173.441(b), 173.457, and 173.427 of this subchapter. (b) Packages of Class 7 (radioactive) material bearing “RADIOACTIVE YELLOW-II” or “RADIOACTIVE YELLOW-III” labels may not be placed in a transport vehicle, storage location or in any other place closer than the distances shown in the following table to any area which may be continuously occupied by any passenger, employee, or animal, nor closer than the distances shown in the table to any package containing undeveloped film (if so marked), and must conform to the following conditions: (1) If more than one of these packages is present, the distance must be computed from the following table on the basis of the total transport index number determined by adding together the transport index number on the labels on the individual packages and overpacks in the vehicle or storeroom. (2) Where more than one group of packages is present in any single storage location, a single group may not have a total transport index greater than 50. Each group of packages must be handled and stored together no closer than 6 m (20 feet) (measured edge to edge) to any other group. The following table is to be used in accordance with the provisions of paragraph (b) of this section: Total transport index Minimum separation distance in meters (feet) to nearest undeveloped film in various times of transit Minimum distance in meters (feet) to area of persons, or minimum distance in meters (feet) from dividing partition of cargo compartments Up to 2 hours 2-4 hours 4-8 hours 8-12 hours Over 12 hours None 0.0 (0) 0.0 (0) 0.0 (0) 0.0 (0) 0.0 (0) 0.0 (0) 0.1 to 1.0 0.3 (1) 0.6 (2) 0.9 (3) 1.2 (4) 1.5 (5) 0.3 (1) 1.1 to 5.0 0.9 (3) 1.2 (4) 1.8 (6) 2.4 (8) 3.4 (11) 0.6 (2) 5.1 to 10.0 1.2 (4) 1.8 (6) 2.7 (9) 3.4 (11) 4.6 (15) 0.9 (3) 10.1 to 20.0 1.5 (5) 2.4 (8) 3.7 (12) 4.9 (16) 6.7 (22) 1.2 (4) 20.1 to 30.0 2.1 (7) 3.0 (10) 4.6 (15) 6.1 (20) 8.8 (29) 1.5 (5) 30.1 to 40.0 2.4 (8) 3.4 (11) 5.2 (17) 6.7 (22) 10.1 (33) 1.8 (6) 40.1 to 50.0 2.7 (9) 3.7 (12) 5.8 (19) 7.3 (24) 11.0 (36) 2.1 (7) Note: (c) Shipments of low specific activity materials and surface contaminated objects, as defined in § 173.403 of this subchapter, must be loaded so as to avoid spillage and scattering of loose materials. Loading restrictions are set forth in § 173.427 of this subchapter. (d) Packages must be so blocked and braced that they cannot change position during conditions normally incident to transportation. (e) Persons should not remain unnecessarily in a vehicle containing Class 7 (radioactive) materials. (f) The number of packages of fissile Class 7 (radioactive) material in any non-exclusive use transport vehicle must be limited so that the sum of the criticality safety indices (CSIs) does not exceed 50. In loading and storage areas, fissile material packages must be grouped so that the sum of CSIs in any one group is not greater than 50; there may be more than one group of fissile material packages in a loading or storage area, so long as each group is at least 6 m (20 feet) away from all other such groups. All pertinent requirements of §§ 173.457 and 173.459 apply. (g) For shipments transported under exclusive use conditions the radiation dose rate may not exceed 0.02 mSv per hour (2 mrem per hour) in any position normally occupied in the motor vehicle. For shipments transported as exclusive use under the provisions of § 173.441(b) of this subchapter for packages with external radiation levels in excess of 2 mSv (200 mrem per hour) at the package surface, the motor vehicle must meet the requirements of a closed transport vehicle (see § 173.403 of this subchapter). The sum of criticality safety indices (CSIs) for packages containing fissile material may not exceed 100 in an exclusive use vehicle. [Amdt. 177-85, 60 FR 50334, Sept. 28, 1995, as amended at 63 FR 52850, Oct. 1, 1998; 66 FR 45385, Aug. 28, 2001; 69 FR 3696, Jan. 26, 2004; 87 FR 79784, Dec. 27, 2022] § 177.843 Contamination of vehicles. (a) Each motor vehicle used for transporting Class 7 (radioactive) materials under exclusive use conditions in accordance with § 173.427(b)(4), § 173.427(c), or § 173.443(b) of this subchapter must be surveyed with radiation detection instruments after each use. A vehicle may not be returned to Class 7 (radioactive) materials exclusive use transport service, and then only for a subsequent exclusive use shipment utilizing the provisions of any of the paragraphs § 173.427(b)(4), § 173.427(c), or § 173.443(b), until the radiation dose rate at every accessible surface is 0.005 mSv/h (0.5 mrem/h) or less and the non-fixed contamination is not greater than the level prescribed in § 173.443(a) of this subchapter. (b) This section does not apply to any vehicle used solely for transporting Class 7 (radioactive) material if a survey of the interior surface shows that the radiation dose rate does not exceed 0.1 mSv per hour (10 mrem per hour) at the interior surface or 0.02 mSv per hour (2 mrem per hour) at 1 meter (3.3 feet) from any interior surface. These vehicles must be stenciled with the words “For Radioactive Materials Use Only” in lettering at least 7.6 cm (3 inches) high in a conspicuous place, on both sides of the exterior of the vehicle. These vehicles must be kept closed at all times other than loading and unloading. (c) In case of fire, accident, breakage, or unusual delay involving shipments of Class 7 (radioactive) material, see §§ 171.15, 171.16 and 177.854 of this subchapter. (d) Each transport vehicle used to transport Division 6.2 materials must be disinfected prior to reuse if a Division 6.2 material is released from its packaging during transportation. Disinfection may be by any means effective for neutralizing the material released. [Amdt. 177-3, 33 FR 14933, Oct. 4, 1968, as amended by Amdt. 177-35, 41 FR 16131, Apr. 15, 1976; Amdt. 177-57, 48 FR 10247, Mar. 10, 1983; Amdt. 177-78, 55 FR 52712, Dec. 21, 1990; Amdt. 177-85, 60 FR 50335, Sept. 28, 1995; 63 FR 52850, Oct. 1, 1998; 65 FR 58631, Sept. 29, 2000; 67 FR 53142, Aug. 14, 2002; 75 FR 53597, Sept. 1, 2010; 79 FR 40618, July 11, 2014] Subpart C—Segregation and Separation Chart of Hazardous Materials § 177.848 Segregation of hazardous materials. (a) This section applies to materials which meet one or more of the hazard classes defined in this subchapter and are: (1) In packages that must be labeled or placarded in accordance with part 172 of this subchapter; (2) In a compartment within a multi-compartmented cargo tank subject to the restrictions in § 173.33 of this subchapter; or (3) In a portable tank loaded in a transport vehicle or freight container. (b) When a transport vehicle is to be transported by vessel, other than a ferry vessel, hazardous materials on or within that vehicle must be stowed and segregated in accordance with § 176.83(b) of this subchapter. (c) In addition to the provisions of paragraph (d) of this section and except as provided in § 173.12(e) of this subchapter, cyanides, cyanide mixtures or solutions may not be stored, loaded and transported with acids if a mixture of the materials would generate hydrogen cyanide; Division 4.2 materials may not be stored, loaded and transported with Class 8 liquids; and Division 6.1 Packing Group I, Hazard Zone A material may not be stored, loaded and transported with Class 3 material, Class 8 liquids, and Division 4.1, 4.2, 4.3, 5.1 or 5.2 materials. (d) Except as otherwise provided in this subchapter, hazardous materials must be stored, loaded or transported in accordance with the following table and other provisions of this section: Segregation Table for Hazardous Materials Class or division Notes 1.1 1.2 1.3 1.4 1.5 1.6 2.1 2.2 2.3 gas zone A 2.3 gas Zone B 3 4.1 4.2 4.3 5.1 5.2 6.1 liquids PG I zone A 7 8 liquids only Explosives 1.1 and 1.2 A * * * * * X X X X X X X X X X X X X Explosives 1.3 * * * * * X X X X X X X X X X Explosives 1.4 * * * * * O O O O O O O Very insensitive explosives 1.5 A * * * * * X X X X X X X X X X X X X Extremely insensitive explosives 1.6 * * * * * Flammable gases 2.1 X X O X X O O O Non-toxic, non-flammable gases 2.2 X X Poisonous gas Zone A 2.3 X X O X X X X X X X X X Poisonous gas Zone B 2.3 X X O X O O O O O O O O Flammable liquids 3 X X O X X O O X Flammable solids 4.1 X X X O X O Spontaneously combustible materials 4.2 X X O X X O X X Dangerous when wet materials 4.3 X X X X O X O Oxidizers 5.1 A X X X X O O X O Organic peroxides 5.2 X X X X O X O Poisonous liquids PG I Zone A 6.1 X X O X O X X X X X X X Radioactive materials 7 X X O Corrosive liquids 8 X X O X X O O X O O O X (e) lnstructions for using the segregation table for hazardous materials are as follows: (1) The absence of any hazard class or division or a blank space in the table indicates that no restrictions apply. (2) The letter “X” in the table indicates that these materials may not be loaded, transported, or stored together in the same transport vehicle or storage facility during the course of transportation. (3) The letter “O” in the table indicates that these materials may not be loaded, transported, or stored together in the same transport vehicle or storage facility during the course of transportation unless separated in a manner that, in the event of leakage from packages under conditions normally incident to transportation, commingling of hazardous materials would not occur. Notwithstanding the methods of separation employed, Class 8 (corrosive) liquids may not be loaded above or adjacent to Class 4 (flammable) or Class 5 (oxidizing) materials; except that shippers may load truckload shipments of such materials together when it is known that the mixture of contents would not cause a fire or a dangerous evolution of heat or gas. (4) The “*” in the table indicates that segregation among different Class 1 (explosive) materials is governed by the compatibility table in paragraph (f) of this section. (5) The note “A” in the second column of the table means that, notwithstanding the requirements of the letter “X”, ammonium nitrate (UN1942) and ammonium nitrate fertilizer may be loaded or stored with Division 1.1 (explosive) or Division 1.5 materials, unless otherwise prohibited by § 177.835(c). (6) When the § 172.101 table or § 172.402 of this subchapter requires a package to bear a subsidiary hazard label, segregation appropriate to the subsidiary hazard must be applied when that segregation is more restrictive than that required by the primary hazard. However, hazardous materials of the same class may be stored together without regard to segregation required for any secondary hazard if the materials are not capable of reacting dangerously with each other and causing combustion or dangerous evolution of heat, evolution of flammable, poisonous, or asphyxiant gases, or formation of corrosive or unstable materials. (f) Class 1 (explosive) materials shall not be loaded, transported, or stored together, except as provided in this section, and in accordance with the following table: Compatibility Table For Class 1 (Explosive) Materials Compatibility group A B C D E F G H J K L N S A X X X X X X X X X X X X B X X X (4) X X X X X X X X 4/5 C X X 2 2 X 6 X X X X 3 4/5 D X X (4) 2 2 X 6 X X X X 3 4/5 E X X 2 2 X 6 X X X X 3 4/5 F X X X X X X X X X X X 4/5 G X X 6 6 6 X X X X X X 4/5 H X X X X X X X X X X X 4/5 J X X X X X X X X X X X 4/5 K X X X X X X X X X X X 4/5 L X X X X X X X X X X 1 X X N X X 3 3 3 X X X X X X 4/5 S X 4/5 4/5 4/5 4/5 4/5 4/5 4/5 4/5 4/5 X 4/5 (g) Instructions for using the compatibility table for Class 1 (explosive) materials are as follows: (1) A blank space in the table indicates that no restrictions apply. (2) The letter “X” in the table indicates that explosives of different compatibility groups may not be carried on the same transport vehicle. (3) The numbers in the table mean the following: (i) “1” means an explosive from compatibility group L shall only be carried on the same transport vehicle with an identical explosive. (ii) “2” means any combination of explosives from compatibility groups C, D, or E is assigned to compatibility group E. (iii) “3” means any combination of explosives from compatibility groups C, D, or E with those in compatibility group N is assigned to compatibility group D. (iv) “4” means see § 177.835(g) when transporting detonators. (v) “5” means Division 1.4S fireworks may not be loaded on the same transport vehicle with Division 1.1 or 1.2 (explosive) materials. (vi) “6” means explosive articles in compatibility group G, other than fireworks and those requiring special handling, may be loaded, transported and stored with other explosive articles of compatibility groups C, D and E, provided that explosive substances (such as those not contained in articles) are not carried in the same transport vehicle. (h) Except as provided in paragraph (i) of this section, explosives of the same compatibility group but of different divisions may be transported together provided that the whole shipment is transported as though its entire contents were of the lower numerical division (i.e., Division 1.1 being lower than Division 1.2). For example, a mixed shipment of Division 1.2 (explosive) materials and Division 1.4 (explosive) materials, both of compatibility group D, must be transported as Division 1.2 (explosive) materials. (i) When Division 1.5 materials, compatibility group D, are transported in the same freight container as Division 1.2 (explosive) materials, compatibility group D, the shipment must be transported as Division 1.1 (explosive) materials, compatibility group D. [Amdt. 177-78, 55 FR 52712, Dec. 21, 1990] Editorial Note: For Federal Register www.govinfo.gov. Subpart D—Vehicles and Shipments in Transit; Accidents § 177.854 Disabled vehicles and broken or leaking packages; repairs. (a) Care of lading, hazardous materials. (b) Disposition of containers found broken or leaking in transit. (c) Repairing or overpacking packages. (2) Packages of hazardous materials that are damaged or found leaking during transportation, and hazardous materials that have spilled or leaked during transportation, may be forwarded to destination or returned to the shipper in a salvage packaging in accordance with the requirements of § 173.3, as applicable, of this subchapter. (d) Transportation of repaired packages. (1) The package must be safe for transportation. (2) The repair of the package must be adequate to prevent contamination of or hazardous admixture with other lading transported on the same motor vehicle therewith. (3) If the carrier is not himself the shipper, the consignee's name and address must be plainly marked on the repaired package. (e) Disposition of unsafe broken packages. (f) Stopped vehicles; other dangerous articles. (1) For motor vehicles other than cargo tank motor vehicles used for the transportation of Class 3 (flammable liquid) or Division 2.1 (flammable gas) materials and not transporting Division 1.1, 1.2, or 1.3 (explosive) materials, warning devices must be set out in the manner prescribed in § 392.22 of this title. (2) For cargo tanks used for the transportation of Class 3 (flammable liquid) or Division 2.1 (flammable gas) materials, whether loaded or empty, and vehicles transporting Division 1.1, 1.2, or 1.3 (explosive) materials, warning devices must be set out in the manner prescribed by § 392.25 of this title. (g) Repair and maintenance of vehicles containing certain hazardous materials General. (2) Repair and maintenance inside a building. (i) The motor vehicle's cargo and fuel containment systems are closed (except as necessary to maintain or repair the vehicle's motor) and do not show any indication of leakage; (ii) A means is provided, and a person capable to operate the motor vehicle is available, to immediately remove the motor vehicle if necessary in an emergency; (iii) The motor vehicle is removed from the enclosed area upon completion of repair or maintenance work; and (iv) For motor vehicles loaded with Division 1.1, 1.2, or 1.3 (explosive), Class 3 (flammable liquid), or Division 2.1 (flammable gas) materials, all sources of spark, flame or glowing heat within the area of enclosure (including any heating system drawing air therefrom) are extinguished, made inoperable or rendered explosion-proof by a suitable method. Exception: (h) No repair with flame unless gas-free. [29 FR 18795, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register www.govinfo.gov. Subpart E—Regulations Applying to Hazardous Material on Motor Vehicles Carrying Passengers for Hire § 177.870 Regulations for passenger carrying vehicles. (a) Vehicles transporting passengers and property. (b) No Class 1 (explosive) materials or other hazardous materials on passenger-carrying vehicles, exceptions. (c) Class 1 (explosive) materials in passenger-carrying space forbidden. (d) Hazardous materials on passenger carrying vehicles; quantity. Provided, however, (e) Articles other than Class 1 (explosive) materials on passenger-carrying vehicles. (f) Division 6.1 (poisonous) or Division 2.3 (poisonous gas) materials on passenger-carrying vehicles. (g) Class 7 (radioactive) materials. [29 FR 18795, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967] Editorial Note: For Federal Register www.govinfo.gov.

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