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Pick a part and two dates. Every section whose wording changed in between is listed with a link to the exact diff. Built for the deposition question "has this rule changed since the crash?"
Part 393 — Parts and Accessories Necessary for Safe Operation
Between Oct. 1, 1996 and today (current through Oct. 15, 2026): 59 amended, 19 added, 3 removed, 12 unchanged.
Oct. 1, 1996 falls before day-level history begins (Jan. 1, 2017). It is read from the annual CFR edition in force that day (revised as of October 1), so an amendment that took effect earlier in that edition year is counted as already in place. Federal Register citations on each section give exact effective dates.
- Amended§ 393.1 Scope of the rules in this part.View diffChanged 3 times: Oct. 1, 2005; Oct. 1, 2009; Oct. 1, 2016
- Amended§ 393.3 Additional equipment and accessories.View diffChanged Oct. 1, 2013
- Amended§ 393.5 Definitions.View diffChanged 15 times: Oct. 1, 1998; Oct. 1, 1999; Oct. 1, 2002; Oct. 1, 2003; Oct. 1, 2005; Oct. 1, 2006; Oct. 1, 2007; Oct. 1, 2009; Oct. 1, 2016; Jan. 1, 2017; Nov. 9, 2021; Dec. 9, 2021; March 7, 2022; May 6, 2022; Nov. 18, 2024
- Amended§ 393.7 Matter incorporated by reference.View diffChanged 8 times: Oct. 1, 2002; Oct. 1, 2003; Oct. 1, 2004; Oct. 1, 2005; Oct. 1, 2006; Oct. 1, 2007; Oct. 1, 2012; Oct. 1, 2015
- Amended§ 393.9 Lamps operable, prohibition of obstructions of lamps and reflectors.View diffChanged Oct. 1, 2005
- Amended§ 393.11 Lamps and reflective devices.View diffChanged 10 times: Oct. 1, 2001; Oct. 1, 2005; Oct. 1, 2006; Oct. 1, 2007; Oct. 1, 2009; Oct. 1, 2012; Oct. 1, 2013; Oct. 1, 2016; Jan. 1, 2017; March 23, 2026
- Added§ 393.13 Retroreflective sheeting and reflex reflectors, requirements for semitrailers and trailers manufactured before December 1, 1993.Read itChanged 3 times: Oct. 1, 1999; Oct. 1, 2001; Oct. 1, 2009
- Amended§ 393.17 Lamps and reflectors—combinations in driveaway-towaway operation.View diffChanged 3 times: Oct. 1, 2005; Oct. 1, 2012; Oct. 1, 2015
- Amended§ 393.19 Hazard warning signals.View diffChanged Oct. 1, 2005
- Amended§ 393.20 [Reserved]View diffChanged Oct. 1, 2005
- Amended§ 393.23 Power supply for lamps.View diffChanged Oct. 1, 2005
- Amended§ 393.24 Requirements for head lamps, auxiliary driving lamps and front fog lamps.View diffChanged Oct. 1, 2005
- Amended§ 393.25 Requirements for lamps other than head lamps.View diffChanged Oct. 1, 2005
- Amended§ 393.26 Requirements for reflectors.View diffChanged Oct. 1, 2005
- Amended§ 393.27 [Reserved]View diffChanged Oct. 1, 2005
- Amended§ 393.28 Wiring systems.View diffChanged Oct. 1, 2005
- Amended§ 393.29 [Reserved]View diffChanged Oct. 1, 2005
- Removed§ 393.31 Overload protective devices.Read the removed textRemoved Oct. 1, 2005
- Added§ 393.31-393.33 [Reserved]Read itAdded Oct. 1, 2005
- Removed§ 393.32 Detachable electrical connections.Read the removed textRemoved Oct. 1, 2005
- Removed§ 393.33 Wiring, installation.Read the removed textRemoved Oct. 1, 2005
- Amended§ 393.40 Required brake systems.View diffChanged 3 times: Oct. 1, 2005; Oct. 1, 2007; Oct. 1, 2009
- Amended§ 393.41 Parking brake system.View diffChanged Oct. 1, 2005
- Amended§ 393.42 Brakes required on all wheels.View diffChanged 5 times: Oct. 1, 2005; Oct. 1, 2011; Oct. 1, 2012; Feb. 19, 2026; March 23, 2026
- Amended§ 393.43 Breakaway and emergency braking.View diffChanged Oct. 1, 2005
- Amended§ 393.45 Brake tubing and hoses; hose assemblies and end fittings.View diffChanged 2 times: Oct. 1, 2005; July 21, 2026
- Amended§ 393.46 [Reserved]View diffChanged Oct. 1, 2005
- Amended§ 393.47 Brake actuators, slack adjusters, linings/pads and drums/rotors.View diffChanged 6 times: Oct. 1, 1999; Oct. 1, 2001; Oct. 1, 2005; Oct. 1, 2009; Oct. 1, 2012; Oct. 14, 2021
- Amended§ 393.48 Brakes to be operative.View diffChanged 3 times: Oct. 1, 2003; Oct. 1, 2005; Oct. 1, 2007
- Amended§ 393.49 Control valves for brakes.View diffChanged 2 times: Oct. 1, 2007; Oct. 1, 2013
- Amended§ 393.50 Reservoirs required.View diffChanged Oct. 1, 2005
- Amended§ 393.51 Warning signals, air pressure and vacuum gauges.View diffChanged Oct. 1, 2005
- Amended§ 393.52 Brake performance.View diffChanged 5 times: Oct. 1, 2002; Oct. 1, 2003; Oct. 1, 2004; Oct. 1, 2012; Jan. 1, 2017
- Amended§ 393.53 Automatic brake adjusters and brake adjustment indicators.View diffChanged Oct. 1, 2012
- Added§ 393.55 Antilock brake systems.Read itChanged 3 times: Oct. 1, 1998; Oct. 1, 2010; Oct. 1, 2011
- Amended§ 393.60 Glazing in specified openings.View diffChanged 8 times: Oct. 1, 1998; Oct. 1, 2016; Jan. 1, 2017; May 17, 2018; June 18, 2018; March 7, 2022; May 6, 2022; May 9, 2022
- Amended§ 393.61 Truck and truck tractor window construction.View diffChanged Oct. 1, 2005
- Amended§ 393.62 Emergency exits for buses.View diffChanged Oct. 1, 2005
- Amended§ 393.63 [Reserved]View diffChanged Oct. 1, 2005
- Amended§ 393.65 All fuel systems.View diffChanged 2 times: Feb. 19, 2026; March 23, 2026
- Amended§ 393.67 Liquid fuel tanks.View diffChanged 6 times: Oct. 1, 2001; Oct. 1, 2004; Oct. 1, 2005; Oct. 1, 2013; Feb. 19, 2026; March 23, 2026
- Added§ 393.68 Compressed natural gas fuel containers.Read itAdded Oct. 1, 2005
- Amended§ 393.70 Coupling devices and towing methods, except for driveaway-towaway operations.View diffChanged Oct. 1, 2005
- Amended§ 393.71 Coupling devices and towing methods, driveaway-towaway operations.View diffChanged 9 times: Oct. 1, 2001; Oct. 1, 2003; Oct. 1, 2005; Oct. 1, 2011; Oct. 1, 2012; Oct. 1, 2013; Oct. 1, 2015; Jan. 1, 2017; Oct. 14, 2021
- Amended§ 393.75 Tires.View diffChanged 8 times: Oct. 1, 1998; Oct. 1, 2001; Oct. 1, 2002; Oct. 1, 2005; Oct. 1, 2009; Oct. 1, 2016; Feb. 19, 2026; March 23, 2026
- Amended§ 393.77 Heaters.View diffChanged 3 times: Oct. 1, 2001; Oct. 1, 2012; Oct. 1, 2013
- Amended§ 393.78 Windshield wiping and washing systems.View diffChanged Oct. 1, 2005
- Amended§ 393.79 Windshield defrosting and defogging systems.View diffChanged Oct. 1, 2005
- Amended§ 393.80 Rear-vision mirrors.View diffChanged 2 times: Oct. 1, 2001; Jan. 1, 2017
- Amended§ 393.81 Horn.View diffChanged Oct. 1, 2006
- Amended§ 393.82 Speedometer.View diffChanged Oct. 1, 2005
- Amended§ 393.86 Rear impact guards and rear end protection.View diffChanged 7 times: Oct. 1, 1999; Oct. 1, 2001; Oct. 1, 2003; Nov. 9, 2021; Dec. 9, 2021; Feb. 19, 2026; March 23, 2026
- Amended§ 393.87 Warning flags on projecting loads.View diffChanged Oct. 1, 2005
- Amended§ 393.90 Buses, standee line or bar.View diffChanged Oct. 1, 2001
- Amended§ 393.92 [Reserved]View diffChanged Oct. 1, 2005
- Amended§ 393.93 Seats, seat belt assemblies, and seat belt assembly anchorages.View diffChanged Oct. 1, 2007
- Amended§ 393.94 Interior noise levels in power units.View diffChanged 2 times: Oct. 1, 2005; Oct. 1, 2006
- Amended§ 393.95 Emergency equipment on all power units.View diffChanged 12 times: Oct. 1, 2002; Oct. 1, 2003; Oct. 1, 2005; Oct. 1, 2006; Oct. 1, 2007; Oct. 1, 2008; Oct. 1, 2009; Oct. 1, 2013; Oct. 1, 2015; Feb. 19, 2026; March 23, 2026; April 20, 2026
- Amended§ 393.100 Applicability and general requirements of cargo securement standards.View diffChanged 2 times: Oct. 1, 2003; Nov. 18, 2024
- Amended§ 393.102 Minimum performance criteria for cargo securement devices and systems.View diffChanged 6 times: Oct. 1, 2003; Oct. 1, 2006; Oct. 1, 2009; Oct. 1, 2010; Oct. 1, 2013; Nov. 18, 2024
- Amended§ 393.104 Standards for cargo securement devices and systems.View diffChanged 4 times: Oct. 1, 2003; Oct. 1, 2006; Oct. 1, 2013; Nov. 18, 2024
- Amended§ 393.106 General requirements for securing articles of cargo.View diffChanged 3 times: Oct. 1, 2003; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.108 Determining the working load limit of a tiedown or the load restraining value of a friction mat.Read itChanged 4 times: Oct. 1, 2002; Oct. 1, 2003; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.110 Additional requirements for determining the minimum number of tiedowns.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.112 Adjustability of tiedowns.Read itChanged 2 times: Oct. 1, 2002; Nov. 18, 2024
- Added§ 393.114 Requirements for front end structures used as part of a cargo securement system.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.116 Specific securement requirements for logs.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.118 Specific securement requirements for dressed lumber and similar building products.Read itChanged 5 times: Oct. 1, 2002; Oct. 1, 2006; Oct. 1, 2009; Oct. 1, 2013; Nov. 18, 2024
- Added§ 393.120 Specific securement requirements for metal coils.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2013; Nov. 18, 2024
- Added§ 393.122 Specific securement requirements for paper rolls.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.124 Specific securement requirements for concrete pipe.Read itChanged 6 times: Oct. 1, 2002; Oct. 1, 2003; Oct. 1, 2004; Oct. 1, 2011; Oct. 1, 2013; Nov. 18, 2024
- Added§ 393.126 Specific securement requirements for intermodal containers.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.128 Specific securement requirements for automobiles, light trucks, and vans.Read itChanged 2 times: Oct. 1, 2002; Nov. 18, 2024
- Added§ 393.130 Specific securement requirements for heavy vehicles, equipment, and machinery.Read itChanged 2 times: Oct. 1, 2002; Nov. 18, 2024
- Added§ 393.132 Specific securement requirements for flattened or crushed vehicles.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2006; Nov. 18, 2024
- Added§ 393.134 Specific securement requirements for roll-on/roll-off and hook lift containers.Read itChanged 2 times: Oct. 1, 2002; Nov. 18, 2024
- Added§ 393.136 Specific securement requirements for large boulders.Read itChanged 3 times: Oct. 1, 2002; Oct. 1, 2013; Nov. 18, 2024
- Amended§ 393.201 Frames.View diffChanged Oct. 1, 2005
- Amended§ 393.203 Cab and body components.View diffChanged 2 times: Oct. 1, 2013; Oct. 1, 2014
- Amended§ 393.207 Suspension systems.View diffChanged Oct. 1, 2005
- Amended§ 393.209 Steering wheel systems.View diffChanged 2 times: Oct. 1, 2005; Jan. 1, 2017
Unchanged (12)
- § 393.22 Combination of lighting devices and reflectors.
- § 393.30 Battery installation.
- § 393.44 Front brake lines, protection.
- § 393.69 Liquefied petroleum gas systems.
- § 393.76 Sleeper berths.
- § 393.83 Exhaust systems.
- § 393.84 Floors.
- § 393.85 [Reserved]
- § 393.88 Television receivers.
- § 393.89 Buses, driveshaft protection.
- § 393.91 Buses, aisle seats prohibited.
- § 393.205 Wheels.