GB,
I would certainly defer to Craig on this one for an informed response, however, my educated guess would be that if the sensing mechanism is located high up and off-angle that the likelihood of any effect would be essentially nil, especially if one considers that pulse-rates of like not being used, per se, to obtain vehicle speeds but, I believe merely serve as a motion "trip-wire" to replace otherwise induction loops which would otherwise be located under the road's surface.
Again, though, I believe CP will be in a better position to provide an
authorative response to your query, as he is closer to this technology than I.
Veil Guy
