Since it began two years ago, the Transportation Planning Board's wheelchair-accessible taxicab pilot program--"rollDC"--has seen an eight-fold increase in the number of trips provided to users of mobility devices living in or visiting the District of Columbia. In a 2011 customer satisfaction survey, 81% of respondents rated their most recent "rollDC" trip either "very good" or "excellent," and nine in ten first-time users said they planned to use the service again in the future.