The speed ticket cameras that I have seen have a camera and a radar device, not just a plain camera.
When I travel from Ratchaburi to Chiang Mai I have seen lots of new cameras set up that look like speed ticket cameras but they seem to work more like instead of placing someone by the road with a radar device and radioing back to the checkpoint these send the plate numbers back to the checkpoint.
So hard to know if they are ones that will mail tickets to you or just for checkpoints.