Avoid going into the glove compartment or underneath seats unless specifically instructed to do so by a police officer. In doing so, such actions will heighten the officer's vigilance and perhaps their actions as well since this is the most common area where a criminal will secret weapons in a vehicle that can potentially be used against a police officer. It is easy to understand that a motorist might feel that stepping from their automobile and moving toward an officer during a traffic stop is a matter of courtesy. In reality, police officers are ultimately responsible for the safety of a vehicle and its occupants during a traffic stop. Exiting passengers can unwittingly step into other passing vehicles or it may signal the officer that the driver may be attempting to assault them.
Some police departments use unmarked or partially marked police vehicles for traffic enforcement.
If you are unsure that the vehicle attempting to stop you is bona fide, you should drive slowly to a well-light, safe area before stopping. If you are given a ticket, you should sign it. Signing the ticket is not an admission of guilt or innocence. You can always challenge the case in court later. If you are suspected of drunk driving and refuse a breath test, your license can be suspended.