US Federal Motor Carrier Safety Regulations (49 CFR Parts 350 to 399) 392.20-71: Stopped vehicles and warning devices, fueling, prohibited practices (unauthorised passengers, towing, radar detectors, texting and hand-held phones), and special rules for buses and emergency signals (392.20 to 392.71, 392.80, 392.82)

What does 392.20-71 require?

A driver who stops a CMV on the highway or shoulder must activate hazard warning flashers and place warning devices within 10 minutes (one at the traffic side within 10 feet, one about 100 feet behind and one about 100 feet ahead, or the 392.22 variations for one-way roads, hills and curves). Fueling rules bar fueling with the engine running or while smoking (392.50, 392.51). The prohibited practices include transporting unauthorised passengers (392.60), unauthorised persons driving (392.62), towing or pushing a loaded bus (392.63), driving with the vehicle's exhaust or carbon monoxide entering the cab (392.66), driving with a radar detector (392.71), texting while driving (392.80) and using a hand-held mobile telephone while driving, including reaching for or holding the device (392.82), each of which the carrier may not allow or require. Buses must have standees behind the line and aisle seats secured, and drivers must ensure doors are closed while the bus is in motion (392.62).