As I was on highway 95 I passed a series of cars (about 5 sedans) which had some type of metal cylinder located on the rear of the roof hooked up to some electrical equipment and possibly other sensers. Now I assume the tube was somekind of Venturi air flow sensor. Most of the cars like the one in this photo had black matt tape around much of the car.
Anybody know what kind of testing they might have been doing?
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