Kuan, I like your idea. But I wonder how will everybody hear the warning? If I'm in my car and the radio is off how would I know? I guess if everbody was stopping something might kick in. But they would have to notify the public that they were going to do that, and that SOB is in the public. Plus I can't see him not stopping too where he is. The delay it would take different people to be aware of the alert would probably give him time to get to his car or whatever he's doing. I still like your idea though, but that's the only problem I can see with it.

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1994 C 280 117.5k, White (Good as new)
1997 Toyota Camry 149k Miles (Not so pretty anymore)

1990 190e 2.6 95k (Sold-Should not have)
1981 240d Stick ??? Miles...sold