States with tolls may need them. I noticed several years ago on an older exit in Chicago, which had an unattended toll station, they had a camera down low, pointing right at the front of the car. I'm still waiting to hear anything from Colorado--I traveled on one of their toll roads about six or seven weeks ago, and they no longer have any attended toll stations. They only have the electronic passes now, and the lanes that were formerly attended are now blocked off. I tried signing up on their site so I could pay any tolls, since they have a system to pay them, but did not find anything. I will have to call and see what the process is.