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...