Radar detectors are legal in California for most private vehicle drivers. There is no state law prohibiting their use in personal cars, and you are allowed to own and operate a radar detector without facing legal penalties for simply having one in your vehicle.
However, there are important restrictions and best practices to follow:
Mounting Restrictions: It is illegal to mount any object, including a radar detector, on the windshield if it obstructs the driver’s view. California Vehicle Code Section 26708(a)(1) specifically prohibits this. Radar detectors must be mounted on the dashboard, center console, or another location that does not block the driver’s line of sight. Mounting on the windshield can result in a ticket.
Commercial Vehicles: Radar detectors are strictly prohibited in commercial vehicles over 10,000 pounds, including trucks, buses, and taxis, as well as ride-share vehicles like those used for Uber and Lyft. This rule is designed to promote road safety and prevent speeding among drivers responsible for passengers or heavy cargo.
Military Bases and Federal Property: The use of radar detectors is not allowed on military bases anywhere in the United States, including California. If you enter a military base, you must turn off or remove your radar detector.
Radar Jammers: While radar detectors are legal, radar jammers—devices designed to interfere with or block police radar signals—are illegal under both California and federal law. Using a radar jammer is a federal offense and can result in significant fines and criminal charges.
Visibility and Scrutiny: Even if your radar detector is legally mounted, highly visible units may attract extra attention from law enforcement. Many drivers choose stealthy mounting options or hardwiring to minimize visibility.
Summary Table: Radar Detector Rules in California
| Vehicle Type | Radar Detector Legal? | Restrictions/Notes |
|---|---|---|
| Private Vehicles | Yes | Cannot be mounted on windshield; dashboard/console OK |
| Commercial Vehicles (>10,000 lbs) | No | Includes trucks, buses, taxis, and ride-share vehicles |
| Military Bases | No | Not allowed anywhere on base |
| Radar Jammers | No | Illegal under state and federal law |
Before using a radar detector in California, ensure you are not operating a commercial vehicle over 10,000 pounds, do not mount the device on your windshield, and never use a radar jammer.
Always be aware of local law enforcement practices and any additional restrictions in certain areas, such as military bases.
Sources:
- https://www.escortradar.com/blogs/news/are-radar-detectors-legal-in-california
- https://www.omegalaw.com/faqs/are-radar-detectors-legal-in-california/
- https://www.rkmlaw.net/radar-detector-legality-in-california/
- https://www.automoblog.com/are-radar-detectors-legal/