In cities across North America, car-era infrastructures such as elevated highways are crumbling. City residents the world over are questioning how best to deal with aging infrastructures built for the automobile during an era of cheap fuel. The environmental crisis obliges cities to think about the environmental costs of car-dependency. Now is the time to weigh also the social, cultural, and economic costs of unrestrained automobility.Transportation engineers and political leaders are about to make decisions that will affect cities for generations to come. This volume brings together a wide range of viewpoints that enriches the discussion.