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Radar Detectors in Illinois: Rules for Drivers

Illinois law cited here prohibits radar or laser jamming devices; commercial drivers must also follow federal detector restrictions.

Illinois radar detector questions often mix up a detector with a jammer. Section 12-613 of the Illinois Vehicle Code prohibits operating or being in control of a vehicle equipped with a device designed to interfere with radar or laser speed measurement, subject to the statute’s stated exception for a device secured and not operating. This is a rule about jamming devices.

Radar Detectors in Illinois: Rules for Drivers

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Questions before you buy

Are radar detectors legal in Illinois?

The cited Illinois section addresses radar or laser jamming devices, not ordinary receive-only detectors. Commercial vehicle use is separately restricted by federal regulation.

Are radar jammers illegal in Illinois?

Illinois Vehicle Code section 12-613 prohibits operating or controlling a vehicle equipped with a device designed to interfere with police radar or laser, subject to a limited exception in the statute.

Can commercial trucks use a radar detector in Illinois?

Federal rule 49 CFR 392.71 prohibits operating a commercial motor vehicle containing a radar detector.

What is the difference between a detector and a jammer?

A detector receives radar signals; a jammer is designed to interfere with or disrupt them. The cited Illinois provision targets the latter.