Insofar as monitoring passage of people, I noted a few hours ago a new installation of cameras at the tollbooths on the George Washington Bridge, positioned to be under a meter from people's faces when they stop to fork over their $4.00. The police density at this toll plaza makes additional surveillance of would-be toll booth robbers unnecessary; while traffic analysis on the matching of facial patterns is probably out of their scope right now, it *is* a precedent, and food for thought... Well -- the cameras may have been prompted by the fact that the toll booths at the GWB have been the targets of armed robberies several times of late... FYI, the George Washington Bridge carries much, probably most, of the traffic into Manhattan and New York City...) Most? Hardly. Don't forget the bridges and tunnels from Brooklyn and Queens, and the two tunnels from New Jersey, and...