on 6/23/2008 8:45 PM Tomes said the following:
My friend was a cop and his take home vehicle was an unmarked Ford Crown Vic with hidden EM lights and siren. Many times someone would come up right on his tail and hang there at less than a car length. My friend turned on the hidden EM lights for a second and the offender would drop back about 10 car lengths. Other times, when he was stuck in a pack and observed a driver that was in hurry and was making gestures to the cars in front of him/her, a tap on the siren calmed everyone down.