Rulebook › 49 CFR Part 393
PART 393—PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION
Official text from the eCFR, current as of 2026-10-22.
Subpart A—General
- § 393.1 Scope of the rules in this part.
- § 393.3 Additional equipment and accessories.
- § 393.5 Definitions.
- § 393.7 Matter incorporated by reference.
Subpart B—Lamps, Reflective Devices, and Electrical Wiring
- § 393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.
- § 393.11 Lamps and reflective devices.
- § 393.13 Retroreflective sheeting and reflex reflectors, requirements for semitrailers and trailers manufactured before December 1, 1993.
- § 393.17 Lamps and reflectors—combinations in driveaway-towaway operation.
- § 393.19 Hazard warning signals.
- § 393.20 [Reserved]
- § 393.22 Combination of lighting devices and reflectors.
- § 393.23 Power supply for lamps.
- § 393.24 Requirements for head lamps, auxiliary driving lamps and front fog lamps.
- § 393.25 Requirements for lamps other than head lamps.
- § 393.26 Requirements for reflectors.
- § 393.27 [Reserved]
- § 393.28 Wiring systems.
- § 393.29 [Reserved]
- § 393.30 Battery installation.
- § 393.31-393.33 [Reserved]
Subpart C—Brakes
- § 393.40 Required brake systems.
- § 393.41 Parking brake system.
- § 393.42 Brakes required on all wheels.
- § 393.43 Breakaway and emergency braking.
- § 393.44 Front brake lines, protection.
- § 393.45 Brake tubing and hoses; hose assemblies and end fittings.
- § 393.46 [Reserved]
- § 393.47 Brake actuators, slack adjusters, linings/pads and drums/rotors.
- § 393.48 Brakes to be operative.
- § 393.49 Control valves for brakes.
- § 393.50 Reservoirs required.
- § 393.51 Warning signals, air pressure and vacuum gauges.
- § 393.52 Brake performance.
- § 393.53 Automatic brake adjusters and brake adjustment indicators.
- § 393.55 Antilock brake systems.
Subpart D—Glazing and Window Construction
- § 393.60 Glazing in specified openings.
- § 393.61 Truck and truck tractor window construction.
- § 393.62 Emergency exits for buses.
- § 393.63 [Reserved]
Subpart E—Fuel Systems
- § 393.65 All fuel systems.
- § 393.67 Liquid fuel tanks.
- § 393.68 Compressed natural gas fuel containers.
- § 393.69 Liquefied petroleum gas systems.
Subpart F—Coupling Devices and Towing Methods
- § 393.70 Coupling devices and towing methods, except for driveaway-towaway operations.
- § 393.71 Coupling devices and towing methods, driveaway-towaway operations.
Subpart G—Miscellaneous Parts and Accessories
- § 393.75 Tires.
- § 393.76 Sleeper berths.
- § 393.77 Heaters.
- § 393.78 Windshield wiping and washing systems.
- § 393.79 Windshield defrosting and defogging systems.
- § 393.80 Rear-vision mirrors.
- § 393.81 Horn.
- § 393.82 Speedometer.
- § 393.83 Exhaust systems.
- § 393.84 Floors.
- § 393.85 [Reserved]
- § 393.86 Rear impact guards and rear end protection.
- § 393.87 Warning flags on projecting loads.
- § 393.88 Television receivers.
- § 393.89 Buses, driveshaft protection.
- § 393.90 Buses, standee line or bar.
- § 393.91 Buses, aisle seats prohibited.
- § 393.92 [Reserved]
- § 393.93 Seats, seat belt assemblies, and seat belt assembly anchorages.
- § 393.94 Interior noise levels in power units.
Subpart H—Emergency Equipment
Subpart I—Protection Against Shifting and Falling Cargo
- § 393.100 Applicability and general requirements of cargo securement standards.
- § 393.102 Minimum performance criteria for cargo securement devices and systems.
- § 393.104 Standards for cargo securement devices and systems.
- § 393.106 General requirements for securing articles of cargo.
- § 393.108 Determining the working load limit of a tiedown or the load restraining value of a friction mat.
- § 393.110 Additional requirements for determining the minimum number of tiedowns.
- § 393.112 Adjustability of tiedowns.
- § 393.114 Requirements for front end structures used as part of a cargo securement system.
- § 393.116 Specific securement requirements for logs.
- § 393.118 Specific securement requirements for dressed lumber and similar building products.
- § 393.120 Specific securement requirements for metal coils.
- § 393.122 Specific securement requirements for paper rolls.
- § 393.124 Specific securement requirements for concrete pipe.
- § 393.126 Specific securement requirements for intermodal containers.
- § 393.128 Specific securement requirements for automobiles, light trucks, and vans.
- § 393.130 Specific securement requirements for heavy vehicles, equipment, and machinery.
- § 393.132 Specific securement requirements for flattened or crushed vehicles.
- § 393.134 Specific securement requirements for roll-on/roll-off and hook lift containers.
- § 393.136 Specific securement requirements for large boulders.