If on a busy street definitely proceed to the nearest place where traffic will not be blocked by two stopped cars. Around here and Im sure most places the cop will park his car a couple feet more toward the center of the road to in effect shield him as he is talking to the suspect so its defintely on their minds too. Signal on to show you see him, slow down, and if for some reason he starts blasting the siren nonstop Id think about just stopping right away. Ive never gotten more then a quick attention getter any time Ive been pulled over so hearing that woud make me think he doesnt want to wait.