The speeding problem will be solved by increased enforcement of traffic laws and special lanes for cars that want to drive faster.
Automated enforcement will be trivial as new technologies such as toll collection transponders become mandatory. Of course, there may be some reluctance to embrace the technology, as seen in the UK: http://www.speedcam.co.uk/gatso2.htm But special lanes are already here. In California we have some freeways with variable pricing that lets non-carpool drivers drive in faster lanes for a fee. The price changes on how much time a driver can save. But a combination approach could be acceptable too--where people are charged a sliding fee based on how fast they drive over the nominal speed limit. - Brad
