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336 pages, Hardcover
First published January 1, 2008
In the last 100 years, this country has built a network of 4 million miles of roadways that, along with automobiles and inexpensive fuel, have allowed us to settle in a very diffuse way. This road network is currently dependent on the internal combustion engine, which is only 20 per cent energy efficient. As more people drive longer distances, the U.S. road network is subject to congestion resulting from a lack of capacity, longer vehicle trips, serious accidents, and delays caused by ongoing road maintenance.