If we go that route Sid then we should switch from a volume tax to a sales tax. That sales tax though should cover the cost of expansion, maintenance, and eventual repalcement. How about tacking a $1,000 public road access fee on the purchase of a new car? It would raise $14 billion in 2013 which will close about half of the funding gap for interstate highways. We would have to go to about $5000 per car to close the gap at the state and city levels