Well, seeing you are in Florida, those roads could be toll roads already... you and the other commuters just don't know it yet. It's hard to keep up with communicating when you have so many miles of toll roads to accumulate. We have to keep adding toll road miles, someone might beat us for #1!!!
But in all seriousness, I hope the OP will filed a Freedom of Information Act request with the state highway department for the locations and uses of all RFID tag readers on the state's roads. Counting cars is one thing, but their are cheaper and less invasive methods to do that. Using the RFIDs is without a doubt "research" tracking an individual and his habits. I bet none of the subjects consented to the studies... I am more than happy to help you research this information.
Regarding the toll road booth speeds, here in Texas, I roll through our toll booths going 85 mph -- and that's when I'm following the posted legal speed limit. One thing they've done right is designing them without the traffic hazards of manned toll booths (and without having to place people in the middle of the road).
My state has 30-50 billion dollars in liabilities for toll roads currently. It's awesome.