Near Coxsackie is an overpass on 87 with what looks like 2 pan/tilt cameras hanging off them on the south side. They set off my laser detector, but not all the time. This happens with several different radar detectors I use. At night I see a flash of light coming from them (again, not all the time). I am assuming that they are using IR LEDs for illumination, and that's what's (falsely) setting off my detector?
What are these? I've driven up and down a good portion of the Thruway and Northway and this is the only overpass that has these, and they've been there for years. There is one pointed at each lane, on the southbound 2 lanes only. They look like pan/tilt mounted cameras, and always appear to be pointed at the same place all the time, except for once when I noticed they were pointed in a crazy direction (upwards or something).
My hypothesis is that they are monitoring traffic flow (generically monitoring speeds of all traffic rather than targeting individual cars) because I have exceeded the PSL under this overpass and never got a ticket in the mail or had a cop pop up down the road.
I don't know why it seems to want to set off an infrared flash only when cars pass under them though. I don't think they are webcams (at least, not a publicly accessible one)but they do look like video cameras. If the video cameras are processing the traffic flow, determining the speed of the cars visually, then why set off the flash?
Could these be like those cameras on cop cars that grab and check each license plate from every car that goes by?
Link to fullsize picture: