The US should halt all road expansion projects. Driving individual cars is wasteful and harmful to the environment...4000 pounds is the average weight of a vehicle that transports an average of 300 pounds of humanity....wasteful. Hybrids, electrics, natural gas are all equally as wasteful. I like cars as much as the next guy, but there is the future to consider...and everyone having a car isn't going to environmentally or economically in the near future.
And DKlent is correct.