Not sure if this is true but something worth looking into.
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 Hello Ladies, 
 Until now, I never even knew about the #77 calling feature and I feel it
 is important enough to share with others! 
 
 It was the Saturday before New Year's and it was about 1 PM in the
 afternoon. Laura was driving from Winchester, to visit a friend in
 Warrenton. Laura pulled out onto the interstate and started following a
 state police car. She was traveling just over 65 mph behind him. Soon
 thereafter an UNMARKED police car pulled up behind her and put his lights
 on. 
 
 My friend and her husband have 4 children (high school and college age)
 and have always told them never to pull over for an unmarked police car
 onto the side of the road. Rather, they should dial #77 on their cell
 phone, tell the dispatcher that you will gladly pull over at the next gas
 station or some other populated area. Laura had actually listened to her
 parents' advice and promptly called #77 on her cell phone to tell the
 dispatcher that she would not pull over right away. She proceeded to tell
 the dispatcher that there were 2 cars, one unmarked behind her and the
 other, marked in front of her. The dispatcher promptly checked to verify
 there were in fact two (2) police cars where she was at. There wasn't and
 she was connected to the policeman in front of her and he told her to keep
 driving, remain calm and that he had back-up already on the way. 
 
 Ten minutes later four (4) patrol cars surrounded her and the unmarked car
 behind her. One (1) policeman went to her side and the others surrounded
 the unmarked car behind hers. They pulled the guy from the car and tackled
 him to the ground. The man was a convicted rapist and was wanted for other
 crimes as well. 
 
 I never knew that bit of advice, but especially for a woman alone in a
 car, you should not pull over for an unmarked car in a secluded area. In
 fact, even a marked car after dark should follow you to a populated area.
 Police have to respect your right to keep going to a "safe" place. You
 obviously need to make some signals that you acknowledge them (I.E., put
 on your hazard lights or call #77 like Laura did.) I am so thankful that
 my friend was just sitting at our book club meeting telling us this scary
 story, rather than us sitting at her house consoling her! Pass this on to
 your friends, awareness is everything. 
 
 PLEASE DO NOT DELETE THIS UNTIL YOU HAVE SHARED IT WITH ALL OF YOUR FAMILY
 AND FRIENDS - IT COULD SAVE THEIR LIFE.