Are Radar Detectors Legal in Michigan? Cars, Trucks and Windshield Rules

Last reviewed: October 4, 2026. This article is general information, not legal advice. We read Michigan statutes in a reproduction of the Michigan Compiled Laws because the Legislature's own site was unavailable to us, so check the official text for recent changes.

If you're driving in Michigan and wondering whether that radar detector on your dash could cause trouble, the answer for most people is reassuring. The places where it does matter are work vehicles and where you put the device. This page covers Michigan only; for other states, see our guide to where radar detectors are legal.

Short answer: yes, radar detectors are legal in Michigan in private passenger vehicles. They are banned in commercial motor vehicles, because Michigan has adopted the federal rule that prohibits them. Michigan's windshield law bars objects that obstruct the driver's view, and its hands-free law bars holding electronic devices while driving, so mount the detector low and leave it alone while you drive.

What we could verify, and what we couldn't

We wanted to quote Michigan law from the Michigan Legislature's website, but it blocked our requests. Instead, we read the statutes in FindLaw's reproduction of the Michigan Compiled Laws, which it lists as current as of January 1, 2025. Here's where that leaves us:

• Verified: Michigan's adoption of the federal motor carrier safety rules (MCL 480.11a), the windshield statute (MCL 257.709) and the hands-free driving law (MCL 257.602b).
• Not found: any Michigan statute that bans radar detectors in private cars, or that bans them in school or construction zones, as some older articles claim.
• Check yourself: whether any of these sections has been amended since early 2025. The official text is on the Michigan Legislature's website.

Private cars: legal in Michigan

A radar detector is a passive receiver. It picks up the signals police radar (and, on many models, laser) guns send and warns you. Michigan, like most states, doesn't ban that in an ordinary car, SUV, pickup or van you use for personal driving.

A detector isn't a defense to a speeding ticket. If you're stopped, the question is your speed, not whether you had a warning.

Commercial vehicles: banned in Michigan too

The federal ban on detectors in commercial motor vehicles (CMVs) sits in 49 CFR part 392, which Michigan adopts in MCL 480.11a. Under the federal rule:

• A driver may not use a detector in a CMV, or operate a CMV that "contains" one, so an unplugged unit in the cab still counts.
• A motor carrier may not require or permit a driver to break the rule (§ 392.71(b)).
• A CMV, under 49 CFR 390.5, generally includes vehicles rated at 10,001 pounds or more used in commerce, vehicles designed or used to carry more than 8 passengers for pay or more than 15 not for pay, and placarded hazmat vehicles.

Michigan's adoption has some exceptions (for example, some intrastate vehicles that aren't CMVs under a different federal definition), so if you drive a lighter work vehicle, check with your employer or the Michigan State Police.

Where to mount it: Michigan's windshield law

MCL 257.709 bars driving with signs, posters, nontransparent material or window film on the windshield and front side windows (with a narrow allowance for tint along the top edge), and with "an object that obstructs the vision of the driver of the vehicle, except as authorized by law."

The statute doesn't mention radar detectors, GPS units or phone mounts, and we didn't find a Michigan provision expressly authorizing windshield mounts. So the safe approach is:

• Mount it on the dash or low on the windshield, where it can't block your view of the road or intersecting roads.
• Keep the cord tidy so it doesn't hang across the glass.
• Avoid airbag deployment areas.

One detail from the statute: section 257.709 says it doesn't apply to a vehicle registered in another state. Visitors still shouldn't block their own view, but the Michigan windshield rule itself is aimed at Michigan-registered vehicles.

Don't hold it: Michigan's hands-free law

Since June 30, 2023, Michigan has banned holding or using a "mobile electronic device" while driving (MCL 257.602b). The definition is broad: "an electronic device that is not permanently installed in a motor vehicle", including devices capable of texting, calls, entertainment or navigation. The listed exceptions include a device "placed in a mount".

A plug-in radar detector isn't permanently installed, so holding one to adjust it while driving could be argued to fall within the ban. In summary, the fines for drivers of ordinary vehicles are a $100 civil fine or 16 hours of community service (or both) for a first violation and $250 or 24 hours for later ones, doubled if you cause a crash while violating the law. The same rules apply to radar alert apps on your phone. Set things up before you drive and keep the device mounted.

Jammers

Michigan doesn't appear to have a statute aimed specifically at jammers, but that doesn't make them safe:

• Radar jammers transmit radio signals. Federal law says no person shall "willfully or maliciously interfere with or cause interference to any radio communications of any station licensed or authorized by or under this chapter or operated by the United States Government" (47 U.S.C. § 333).
• Laser jammers use light, not radio, so that federal statute may not fit them neatly. They are still designed to defeat police enforcement, and we'd treat them as a legal risk.

Quick checklist for Michigan drivers

• Personal car: a detector is fine. Mount it low and leave it alone while driving.
• Work truck, bus or hazmat vehicle: no detector on board at all.
• Phone radar apps: use them only in a mount, hands-free.
• Jammers: don't.

Riding a motorcycle in Michigan? See is lane splitting legal in Michigan.

Sources

• 49 CFR § 392.71 (radar detectors in commercial motor vehicles): Cornell LII
• MCL 480.11a (Michigan adoption of federal motor carrier safety regulations), current as of January 1, 2025: FindLaw
• MCL 257.709 (windshield obstructions), current as of January 1, 2025: FindLaw
• MCL 257.602b (hands-free driving), current as of January 1, 2025: FindLaw
• 47 U.S.C. § 333 (willful or malicious interference with radio communications): Cornell LII