Along with other colleagues at the Urban Information Lab at the University of Texas, we have developed a website showing which areas in major U.S. cities do not have sufficient alternatives to car ownership. Using these methods, we have determined that lack of transit access is a widespread problem. In some of the most severely affected cities, 1 in 8 residents lives in what we refer to as transit deserts.
Using GIS-based mapping technology, we recently assessed 52 U.S. cities, from large metropolises like New York City and Los Angeles to smaller cities such as Wichita. We systematically analyzed transportation and demand at the block group level – essentially, by neighborhoods. Then we classified block groups as “transit deserts,” with inadequate transportation services compared to demand; “transit oases,” with more transportation services than demand; and areas where transit supply meets demand.