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Other prohibited practices
  • No commercial motor vehicle (CMV), other than a bus, may transport a passenger without written authorization from the motor carrier.
  • CMV drivers who wear corrective eye lenses or hearing aids to meet physical qualifications must always wear the lenses or hearing aids while driving.
  • Drivers must not operate a CMV equipped with a radar detector.

The following table outlines several prohibited practices related to CMV driving.

PassengersDrivers must have written authorization from the carrier before transporting any person on a CMV other than a bus. The authorization must include the name of the passenger, the beginning and ending points of transportation, and the date the authorization expires. Though not required, it is a best practice to have the driver carry a copy of the authorization in the vehicle.
No person can ride within a closed vehicle without proper exits.
Glasses and hearing aidsDrivers who need corrective lenses and/or hearing aids to meet physical qualifications must always wear the lenses and/or hearing aid(s) while driving. Drivers with hearing aids are advised to carry a spare power source.
Radar detectorsDrivers are prohibited from operating the vehicle if it is equipped with a radar detector.
Emergency equipmentDrivers are required to use emergency equipment when and as needed. This includes fire extinguishers, warning triangles or flares, and spare fuses.
  • A bus cannot be towed or pushed, or used to tow or push another vehicle, while passengers are aboard unless necessary to prevent a greater hazard to the passengers.
  • All standees must be behind the standee line.
  • All aisle seats must comply with the standards in 393.91.
  • Baggage and freight must be properly stowed and secured.
FuelingDrivers or other employees may not:
  • Fuel a CMV with the engine running (unless it’s impossible otherwise);
  • Smoke or have any flame exposed near a CMV being fueled; or
  • Fuel a CMV unless the nozzle of the fuel hose is continuously in contact with the intake pipe of the fuel tank.
Carbon monoxideA CMV cannot be driven, and passengers cannot be allowed onboard, if an occupant has been affected by carbon monoxide, or carbon monoxide has been detected in the interior, or a condition is discovered that would be likely to produce a carbon-monoxide hazard to the occupants.
Flame-producing heatersNo open-flame heater used in loading or unloading can be in operation while the vehicle is moving.