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California Radar Detector Law: A Driver’s Guide

California Vehicle Code section 28150 targets interference devices, while window obstruction and commercial vehicle rules are separate. Check current official text for your vehicle and installation.

California radar detector law is easiest to understand by separating three issues: passive detection, active jamming and where a device is mounted. Vehicle Code section 28150 prohibits equipment that interferes with speed-measurement devices; section 26708 governs objects attached to vehicle windows. Federal motor carrier rules separately restrict radar detectors in commercial vehicles. For an ordinary passenger vehicle, check each rule against the intended mounting position and confirm the device is a detector rather than a jammer. Product pages can help compare features, but they do not determine legal status. Recheck current laws before driving across state lines.

California Radar Detector Law: A Driver’s Guide

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Questions before you buy

What does California radar detector law prohibit?

Vehicle Code section 28150 prohibits devices designed to jam, scramble, neutralize, disable or otherwise interfere with speed-measurement equipment. Read the full current section for its scope and exceptions.

Is a passive radar detector a jammer?

No. A passive detector receives signals; a jammer is intended to interfere with measurement equipment. Verify product function rather than relying only on its name.

Does California restrict windshield-mounted radar detectors?

Vehicle Code section 26708 regulates objects affixed to vehicle windows and specifies exceptions. Check the current text and avoid obstructing the driver’s view.

Are radar detectors allowed in California commercial vehicles?

Federal regulations prohibit a driver from using a radar detector in a commercial motor vehicle or operating one equipped with a detector. This is separate from rules for private passenger cars.