1cars have reshaped our world since they fist rolled off mass production lines in the early twentieh century. one and two thousand year old roman roads have been replaced by highways longer and wider brides span rivers. The sharp division between urban and rural landscapes has been replaced by suburban sprawl,town and country linked by eight-lane expressways with stop-and-go traffic.Gas stations are everywhere.After a century,our love of gas-powered automobiles is diminishing. As the price of oil rises,the reserves of irreplaceable oil are consumed,and exhaust fumes hamper life in urban areas. alternatives to gas-powered vehicles are becoming inore attractive