You should try the E-470 system around Denver, Colorado. Last October I was driving through there (from Ohio). In December I received a bill ($5). They use cameras to read License Plates and send the bill to address of the owner. I’m glad I wasn’t speeding - they way I read it, I think they could have sent me a speeding ticket also though nothing was “posted” on the road about that (other than the speed limit signs).
The funny(!!) thing, I just received another bill today (7 months later) for an additional $2.5 for what I guess is another segment on the loop from Oct 4th, 2009. Who knows why it took so long.
If there is to be a toll on roads then gas tax should be abolished;conversely I don’t believe toll roads should have been built with any public monies as long as gas taxes do exist.