Despite huge reductions of noxious emissions from factories and cars, Southern California's air is still terrible. It's so bad that the state is requiring that two percent of new cars sold in 1998 be zero polluters and ten percent by 2003. Many researchers here have become preoccupied with teh...

Behind all debates over the adequacy of highway revenues lies the tricky issue of how much money states mad the federal government ought to spend on highways. States and the federal government have historically tried to determine revenue needs with technical reports known as "needs assessments."...

Over the course of this century, public transit systems in the U.S. have lost most of the market share of metropolitan travel to private vehicles. The two principal markets that remain for public transit systems are downtown commuters and transit dependents – people who are too young, too...

Public transit systems differ from many other government enterprises in that they charge a fee, or fare, in much the way that private businesses charge for their services. Transit fares are typically of two sorts: flat or differentiated. For decades transportation scholars have argued in favor...