As of June 22, 2023Chapter 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
- § 393.100Which types of commercial motor vehicles are subject to the cargo securement standards of this subpart, and what general requirements apply?3 versions
- § 393.102What are the minimum performance criteria for cargo securement devices and systems?7 versions
- § 393.104What standards must cargo securement devices and systems meet in order to satisfy the requirements of this subpart?5 versions
- § 393.106What are the general requirements for securing articles of cargo?4 versions
- § 393.108How is the working load limit of a tiedown, or the load restraining value of a friction mat, determined?4 versions
- § 393.110What else do I have to do to determine the minimum number of tiedowns?3 versions
- § 393.112Must a tiedown be adjustable?2 versions
- § 393.114What are the requirements for front end structures used as part of a cargo securement system?3 versions
- Specific Securement Requirements by Commodity Type§ 393.116What are the rules for securing logs?3 versions
- § 393.118What are the rules for securing dressed lumber or similar building products?5 versions
- § 393.120What are the rules for securing metal coils?3 versions
- § 393.122What are the rules for securing paper rolls?3 versions
- § 393.124What are the rules for securing concrete pipe?6 versions
- § 393.126What are the rules for securing intermodal containers?3 versions
- § 393.128What are the rules for securing automobiles, light trucks and vans?2 versions
- § 393.130What are the rules for securing heavy vehicles, equipment and machinery?2 versions
- § 393.132What are the rules for securing flattened or crushed vehicles?3 versions
- § 393.134What are the rules for securing roll-on/roll-off or hook lift containers?2 versions
- § 393.136What are the rules for securing large boulders?3 versions