Basically, the first thing you look for is a gas station, the motorway services use radar to open the doors and they always activate the detector.
But, with experience you can spot (and hear in the car) the frequency alarms that relate to a patrol car. It must be said though, that with laser, they can get from 1 mile away and once the alarm sounds they've got your speed.
[British law does state that to convict on the evidence the officer operating the speed detection device MUST first acertain your speed above the limit and then get a second reading to prosecute on.]
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