This paper was originally prepared as the keynote address for a 12 April 2003 Research Symposium "Understanding Isolation and Change in Urban Neighborhoods", sponsored by the Federal Reserve Bank of Chicago. The conference sponsors provided the paper's title and in that way suggested the central...

This paper summarizes and updates the findings from an earlier study by the same authors of transit systems in Houston (all bus) and San Diego (bus and light rail). Both systems achieved unusually large increases in transit ridership during a period in which most transit systems in other...