No employer may operate a CMV, and no employee may operate one, unless it is equipped and maintained in accordance with Part 393, and every vehicle must be maintained so that its parts and accessories are in safe and proper operating condition at all times (393.1, 393.3). Part 393 sets the technical requirements: lamps, reflectors and conspicuity retroreflective tape (Subpart B, 393.9 to 393.28), brakes including ABS, brake performance, warning devices and brake tubing (Subpart C, 393.40 to 393.55), glazing and window construction (Subpart D), fuel systems (Subpart E), coupling devices and towing methods (Subpart F, 393.70 and 393.71), tires, wheels and rims with tread depth minima of 4/32 inch on steering axles and 2/32 inch elsewhere (393.75), sleeper berths and cab (393.76 to 393.79), windshield wipers, defrosters, horns and speedometer, emergency equipment (fire extinguisher, spare fuses and warning devices, 393.95), and frames, cab and body components, suspension, steering, exhaust systems, floors and rear impact guards (Subpart G, 393.201 to 393.209). Carriers must inspect to these standards under Part 396 and Appendix A.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.