Radar jammers do not work. There is nothing on the market that will actually jam speed radar. There used to be some hand-built units (called the Scorpion Ka-Ultimate or something like that) that had some success but the guy in the US that was building them got a cease and desist from the FCC. No, I never saw one myself.

As for the colour of cars, this is a minor factor when it comes to range. You only need the smallest amount of reflective surface to get a reading off a vehicle. The fact we have a front number plate is enough to get a reading regardless of what colour the car is (never mind the headlights, fogs, indicators, etc)

If you had a very sleek profile car, with no front number plate, pop-up headlights, and no front facing indicators / fogs etc, no chrome grill, THEN the colour of the car will play more of an effect on the range a lidar can target a vehicle.

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