Sustainable Highways: Destination or Mirage?

Highway travel is forecasted to increase steadily worldwide in the foreseeable future. However, this pattern is unsustainable environmentally, economically, financially, and socially. Federal legislation, in particular the Intermodal Surface Transportation Efficiency Act, has made progress toward the goal of sustainability, and technological improvements offer potential for reduced emissions, but both potentials have not been fully realized. Reduced use and redesigned taxes are unlikely possibilities. Ultimately, institutions will have to change. The European Union offers an example of how the institutional change can be implemented in a durable way. This change is important not just for environmental reasons but also for long-term prosperity.