I just tail gate the car infront and hide the car, obviously try drop back a few spots as at least 6 cars will fit in at one time, when you see 6 cars go in pull back from tail gating so you dont get in shit and then at last second they see you attempt to lift there arm as you zoom by.
But I only do it when I dont really want to get picked on i.e in sutho area.. I dont mind any other place most of the cops are pretty nice these days and yet to have a bad experence.
I always figure you treat people nice they will treat you well. seems to work to date