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Using a Radar Detector in California: Rules and Practical Checks

Review the equipment rules that matter: federal commercial-vehicle restrictions, California windshield visibility requirements, and the separate treatment of interference devices.

A radar detector in California raises two separate questions: whether the device is allowed for your vehicle and where it can be mounted. Federal rules prohibit radar detectors in commercial motor vehicles. California law requires a clear field of driver vision, so mounting should not obstruct the windshield view.

Using a Radar Detector in California: Rules and Practical Checks

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Questions before you buy

Are radar detectors legal in California?

The cited California provisions address windshield visibility and equipment that interferes with speed-measurement devices; federal law prohibits detector use in commercial motor vehicles. Confirm the current rules for your vehicle.

Can I mount a radar detector on my windshield in California?

California requires the windshield not to impair the driver?s vision. Choose a location that preserves a clear view and check current state requirements.

Are radar jammers legal in California?

California Vehicle Code Section 28150 prohibits devices designed to interfere with radar, laser, or other electronic speed-measurement equipment. A detector that only receives signals is a different device category.

Can truck drivers use radar detectors in California?

Federal regulation 49 CFR 392.71 prohibits using a radar detector in a commercial motor vehicle or operating one that contains one.