Driver Knowledge Tests Menu

Having a radar detector or jammer in your car is against the law: Having a radar detector or jammer in your car is against the law:

  • A. If you purchased it after 1998.

  • B. Only if it is turned on.

  • C. No matter what your reason is.

  •  
    The correct answer is C
     
    Correct. You are not permitted to use a radar detector or jammer in your vehicle.
     
 
 
 

The law on radar detectors and laser jammers

A radar detector is a device installed in your grille or mounted on the inside of your windscreen which detects if your speed is being monitored by police using a radar gun. They used to be effective with the old style radar guns as they used to take a short period of time to lock onto the signal, but with modern radar they are not. They cause a danger because not only does it encourage drivers to break the speed limit, but if they detect the signal they brake heavily which increases the risk to themselves and other traffic.

Jammers jam the signal from a police radar and they are illegal, too.