You are wrong. Nobody is talking about blowing by an unmarked car but ANY township will tell you if you have suspision its NOT a police officer you do NOT have to stop right then and there, you can drive to a “more” public or lit up street or to your local police station. Yes you CAN use unmarked for traffic enforcement but usually they will use an unmarked car to radar and patrol cars will pull them and ticket them (ex: speed traps on 400). Very rarely will an unmarked car even try to pull you over unless your doing something VERY wrong