If I recall correctly, the Illinois EZ Pass system was needed to combat theft from toll booth operators and their higher ups.
It’s also more efficient for drivers. I live in Iowa, but visit Chicago a lot. I bought an EZ pass because I don’t want to wait in line to pay cash. There are always a few idiots who need five minutes to get their cash together.
An optical meta-material plate cover, which allows light to only reflect in certain directions, might prove useful?