Move It! How the U.S. gets transportation policy wrong—and how to get it right

Wall Street Journal-
We have tremendous technology available that could help make transportation smoother and more efficient. Traffic signals that are centrally controlled by computer can optimize the flow of traffic. Electronic toll-collection tags let drivers pay without stopping. Changeable signs can provide information about the next bus or train, or rough traffic conditions ahead. Freeway-management centers are able to spot roadway incidents, dispatch service vehicles to clear accidents and get traffic moving again.