As of Feb. 13, 2026Chapter III, Subchapter B — Federal Motor Carrier Safety Regulations
Part 393 Parts and Accessories Necessary for Safe Operation
90 sections · What changed since this date
Subpart A—General
Subpart B—Lamps, Reflective Devices, and Electrical Wiring
- § 393.9Lamps operable, prohibition of obstructions of lamps and reflectors.2 versions
- § 393.11Lamps and reflective devices.11 versions
- § 393.13Retroreflective sheeting and reflex reflectors, requirements for semitrailers and trailers manufactured before December 1, 1993.3 versions
- § 393.17Lamps and reflectors—combinations in driveaway-towaway operation.4 versions
- § 393.19Hazard warning signals.2 versions
- § 393.20[Reserved]2 versions
- § 393.22Combination of lighting devices and reflectors.
- § 393.23Power supply for lamps.2 versions
- § 393.24Requirements for head lamps, auxiliary driving lamps and front fog lamps.2 versions
- § 393.25Requirements for lamps other than head lamps.2 versions
- § 393.26Requirements for reflectors.2 versions
- § 393.27[Reserved]2 versions
- § 393.28Wiring systems.2 versions
- § 393.29[Reserved]2 versions
- § 393.30Battery installation.
- § 393.31-393.33[Reserved]
Subpart C—Brakes
- § 393.40Required brake systems.4 versions
- § 393.41Parking brake system.2 versions
- § 393.42Brakes required on all wheels.6 versions
- § 393.43Breakaway and emergency braking.2 versions
- § 393.44Front brake lines, protection.
- § 393.45Brake tubing and hoses; hose assemblies and end fittings.3 versions
- § 393.46[Reserved]2 versions
- § 393.47Brake actuators, slack adjusters, linings/pads and drums/rotors.7 versions
- § 393.48Brakes to be operative.4 versions
- § 393.49Control valves for brakes.3 versions
- § 393.50Reservoirs required.2 versions
- § 393.51Warning signals, air pressure and vacuum gauges.2 versions
- § 393.52Brake performance.6 versions
- § 393.53Automatic brake adjusters and brake adjustment indicators.2 versions
- § 393.55Antilock brake systems.3 versions
Subpart D—Glazing and Window Construction
Subpart E—Fuel Systems
Subpart F—Coupling Devices and Towing Methods
Subpart G—Miscellaneous Parts and Accessories
- § 393.75Tires.9 versions
- § 393.76Sleeper berths.
- § 393.77Heaters.4 versions
- § 393.78Windshield wiping and washing systems.2 versions
- § 393.79Windshield defrosting and defogging systems.2 versions
- § 393.80Rear-vision mirrors.3 versions
- § 393.81Horn.2 versions
- § 393.82Speedometer.2 versions
- § 393.83Exhaust systems.
- § 393.84Floors.
- § 393.85[Reserved]
- § 393.86Rear impact guards and rear end protection.8 versions
- § 393.87Warning flags on projecting loads.2 versions
- § 393.88Television receivers.
- § 393.89Buses, driveshaft protection.
- § 393.90Buses, standee line or bar.2 versions
- § 393.91Buses, aisle seats prohibited.
- § 393.92[Reserved]2 versions
- § 393.93Seats, seat belt assemblies, and seat belt assembly anchorages.2 versions
- § 393.94Interior noise levels in power units.3 versions
Subpart H—Emergency Equipment
Subpart I—Protection Against Shifting and Falling Cargo
- § 393.100Applicability and general requirements of cargo securement standards.3 versions
- § 393.102Minimum performance criteria for cargo securement devices and systems.7 versions
- § 393.104Standards for cargo securement devices and systems.5 versions
- § 393.106General requirements for securing articles of cargo.4 versions
- § 393.108Determining the working load limit of a tiedown or the load restraining value of a friction mat.4 versions
- § 393.110Additional requirements for determining the minimum number of tiedowns.3 versions
- § 393.112Adjustability of tiedowns.2 versions
- § 393.114Requirements for front end structures used as part of a cargo securement system.3 versions
- Specific Securement Requirements by Commodity Type§ 393.116Specific securement requirements for logs.3 versions
- § 393.118Specific securement requirements for dressed lumber and similar building products.5 versions
- § 393.120Specific securement requirements for metal coils.3 versions
- § 393.122Specific securement requirements for paper rolls.3 versions
- § 393.124Specific securement requirements for concrete pipe.6 versions
- § 393.126Specific securement requirements for intermodal containers.3 versions
- § 393.128Specific securement requirements for automobiles, light trucks, and vans.2 versions
- § 393.130Specific securement requirements for heavy vehicles, equipment, and machinery.2 versions
- § 393.132Specific securement requirements for flattened or crushed vehicles.3 versions
- § 393.134Specific securement requirements for roll-on/roll-off and hook lift containers.2 versions
- § 393.136Specific securement requirements for large boulders.3 versions