We have that in parts of North Carolina as well. I'll tell you this, of all the modern technology all around us, I have to think that this is one of the most mind blowing that I have seen. It photographs you license plate and at the end of the month it sends you a bill for use of a highway. I have no idea what happens with out of state cars (there are no toll booths) or, since this is red neck country, plates that are covered with the red soil of the south.
It also is mind blowing that I will get a bill for 50 cents. I'm not sure how they cover the cost of the letter, a clear photo of my car and plate, envelope and postage. What's postage now, around 47 cents isn't it. Oh, well... I guess it must work somehow. They used to use that same system at intersection to catch people running red lights. Worked really well too. For some reason they stopped doing that a couple of years ago. If you ran a red light you received a ticket in the mail. You either paid the fine or went to court depending on how sure you were that you didn't do it, even though they had a picture of your car going under the bright red light.