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No they do not, sat nav system does and there are no plans for this in the future. There are several reasons for this. Laser detection is illegal to have in Europe and these units are designed for sale and use across Europe so it is not built in.
Laser detection more often than not will only confirm that you have been hit however since it's a narrow light beam that is only emitted when the police are firing their gun at you. Since it works at the speed of light you will in most instances have been had before you can react. Your only chance is getting some scatter if the car in front is targeted from a distance. For more info see here:
http://www.road-angel.co.uk/how_laser_works.htm
Some places sell additional separate products to run alongside Road Angels but it should be noted that any sort of laser detection mounted down by the number plate is particularly ineffective since its line of sight of the road ahead is blocked by other cars in front of you and it would only see laser when its your time to be hit - and just therefore confirm you have been caught.
Instead data is being compiled of the most common mobile sites which are being added to the database thereby giving you some advanced warning and you can also add your own alerts whenever you see a mobile van by pressing the store button on your unit as you pass.
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