I think you can continue to drive until you come to a stop at a public place. I was reading about a young women with a unmarked car behind attempting to pull her over. she called some police number and somehow asked if there was an unmarked car chasing her. they told her it wasnt a police car and they sent an actual marked car to run the unmarked cars tag. turns out it was some rapist guy who had a fake badge, cuffs, and gun looking for the next victim. she was smart to do that, saved her own life.