If you are ever unsure about being pulled over. Continue to drive slowly to the nearest place of business such as a gas station, fast food restaurant, police station, fire station, any place that other people are at. If at night, pull into a well lit spot. Do not roll your window completely down, just enough where you can communicate, make sure your door is locked. It is also appropriate to call 911 from your cell phone and give your location and explain that you are being pulled over but are unsure about who is pulling you over. A dispatcher will be able to confirm if it is a legitimate police stop and direct you from there.