In 2000, the average driver in US metropolitan areas endured 27 hours of traffic delays, a rise from 7 hours in 1980. In many other countries, traffic delays are considerably worse than in the United States, and in developing countries urban traffic congestion is increasing with alarming...

Streets are more than public utilities, more than mere traffic conduits, more than the equivalent of water lines and sewers and electric cables, more than linear physical spaces that permit people and goods to get from here to here. To be sure, communication remains a major purpose, along with...

Transportation planners and economists are urging us to adopt congestion pricing - to charge motorists more for driving on crowded roads during rush hours and less for traveling on uncrowded roads in off-peak hours. By putting a price on peak-hour travel, we would encourage motorists to switch...