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Yeah, that was addressed when the mallninja was at large, here in Austin. It is extremely rare to deploy an unmarked vehical on traffic control/patrol. So rare, as to almost [b]never[/b] happen. For all practical purposes, it just doesn't happen.
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Uhh...not quite. Unmarked cars get used for traffic enforcement ALL of the time.
Texas law does not make any allowance for whatbtype of car is to be used in traffic stops, or what kind of equipment it has. The minmum legal requiremtn for an "emergency vehicle" is a red light displayed on the front.
That being said, an umarked cop car used in traffic enforcement will probably have the following:
1) It will be Crown Vic (now called "Police Interceptor) of some type;
2) Red and blue strobe lights mounted on the dash or somewhere else on the front;
3) "Wig-wag" flashing headlights;
4)Possibly some strobes mounted in the turn signals.
My suggestion is that if one of these gets behind you, you go ahead and stop. If you live in the Austin area, many of your local agencies, including Austin, rountinely use those kinds of vehicles for traffic stops.
For what is worth, though, I wouldn't pull over for my "cop car" (it looks nothing like I described above) and wouldn't blame anyone else for not stopping for it, either.