Radar detectors

Scope

This prohibition applies to CMVs operated in interstate commerce.

Regulatory citations

• 49 CFR 392.71 — Radar detectors; use and/or possession

Key definitions

• Commercial motor vehicle (CMV): A self-propelled or towed motor vehicle used on a highway, in interstate commerce, that meets any one of the following criteria:
  • Has a gross vehicle weight rating (GVWR) or gross combination weight rating (GCWR), or gross vehicle weight (GVW) or gross combination weight (GCW), of 10,001 pounds or more, whichever is greater; or
  • Is designed or used to transport more than 8 passengers including the driver) for compensation; or
  • Is designed or used to transport more than 15 passengers (including the driver), and not used to transport passengers for compensation; or
  • Is transporting hazardous materials of a type or quantity which requires placarding.

• Radar detector: Any device that will detect radio microwaves, laser beams, or any other future speed-measuring technology that law enforcement officers may use to enforce speed limits.

Summary of requirements

Drivers are prohibited from operating a CMV if it is equipped with or contains a radar detector. Motor carriers may not permit or require a driver to violate the restriction. Radar detectors are prohibited in the driver’s compartment, regardless of whether they are plugged in.