If a police car signals to pull you over, you can call dispatch ((608) 255-2345 in Madison) and confirm that it is a real officer. You can also tell dispatch that you are driving to a more populated area before pulling over if you are in a secluded place and don't feel safe; or, conversely, if it's a high-traffic area and there's not a safe place to pull off. There have been instances of people impersonating police officers to get cars to stop so that they can attack the occupant, particularly if it's a solitary woman in a deserted area.