We had Prepass transponders but they do not work at all inspection sites, there has to be a reader as you near a site. Our prepass only worked at a few sites in the north east. Talking to a NY DOT officer last week we discussed Drivewize, he told me that they should and actually do operate at all sites as I have witnessed, they do not need any sensors, the cops have an app on each DOT vehicle they can just switch it to bypass for all Drivewize vehicles to bypass, even the most remote Vermont inspection site will tell me to either follow signs or bypass.
We have had to hand all the prepass units in.