Sp!ke
Administrator
If there is only one person ie the driver, I know it not a police car.
This is so incorrect.
Unmarked cars rarely have two occupants now due to the camera equipment installed.
The truth of it that its almost impossible to spot an unmarked car. It could be any vehicle, in any colour, with one or two occupants, with an extra mirror or without an extra mirror, With high vis jackets or without.
Basically, treat every other vehicle on the road with suspicion. Better still, don't go over 100 unless there is no other vehicle visible on the road ahead or behind.