That is also a simple solution. It is trivial to change the "tax" rate, and even later it by area. About the only thing you can't do is take time of day into

That is also a simple solution. It is trivial to change the "tax" rate, and even later it by area. About the only thing you can't do is take time of day into account. But other solutions solve that like the car pool lanes you can go into if you have a toll transponder and agree to the price shown which are already available in the area. I don't understand why they keep trying to come up with these complex technological solutions. Unless they are barring visitors not all cars will have whatever it is they want installed.