Radar detectors and trucks: read this before buying

Who the federal ban covers

• Commercial motor vehicles with a GVWR or GCWR over 10,000 lbs — semis, box trucks, many heavy-duty commercial pickups.
• The prohibition applies in all 50 states and D.C., with no state-level exception.
• A detector found during an inspection is an out-of-service-adjacent violation and a compliance problem for the carrier, not just the driver.

Who is not covered

• Privately-owned pickups and SUVs under 10,000 lbs GVWR used for personal driving.
• Personal vehicles driven by CDL holders off-duty.
• Check the GVWR sticker inside the driver's door jamb — that number, not the truck's size, is what the rule keys on.

If your truck falls in this group and your state allows detectors, the McFlash 360 suits high-cab vehicles well: the mount clears a steep windshield rake and the rear antennas cover the angles a tall vehicle otherwise blocks. Check your state.

What commercial drivers can use instead

Navigation apps with speed-limit display and crowd-sourced enforcement reports are legal in a commercial vehicle and cover most of the practical benefit. Combined with a governed cruise setting, that is the compliant approach.

FAQs

Can semi truck drivers use radar detectors?

No. FMCSA regulations prohibit radar detectors in commercial motor vehicles with a gross vehicle weight rating over 10,000 lbs, in every US state.

Can I use a radar detector in my pickup truck?

Yes, if it is a privately-owned passenger vehicle under 10,000 lbs GVWR and you are in a state where detectors are legal. Most half-ton pickups qualify; check your door-jamb GVWR sticker.