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American highways 美国高速公路 A combination of less driving and more fuel-efficient vehicles is imperilling Americas highwaysystem 驾车出行的减少和节能车的增多正在危及美国的高速公路系统 AMERICANS pay a federal fuel tax of 18.4 cents pergallon. That amount was set in 1993, when the average new passenger car on American roadsgot 28.4 miles per gallon , and the best-selling American car got 18mpg in the city and27 on highways. In 2010 the average new passenger car got 33.7mpg. The best-selling car got22mpg in the city and 33 on highways. 美国人支付每加仑18.4美分的联邦燃油税。这一金额是在1993年定下的，那时新的乘用车每加仑油可以在美国道路上平均行驶28.4英里，最畅销的国产车在城里可以行驶18英里，在高速公路上可以行驶27英里。2010年时新乘用车每加仑油平均可以行驶33.7英里，而最畅销车在城里可行驶22英里，在高速公路上可以行驶33英里。 And just as cars are growing more fuel-efficient, Americans are driving less. In 2010 theydrove just under three trillion milesless than they did in 2006. While better fuel-efficiency isgood news for Americans wallets and less driving good for the countrys air, for its highwaysand mass-transit systems, it is something of a disaster. | 
