By passing the Clean Air Act Amendments of 1990 (CAAA) our government intensified efforts to improve the declining air quality in many of our nation’s cities. The passage of the CAAA also signaled the acknowledgment that American commuters must modify travel patterns and behavior. Areas defined as non-attainment by the Environmental Protection Agency must improve their air quality to satisfactory levels or face possible punitive sanctions imposed by the federal government. In response to the changing demands of urban mobility, city and transportation officials aggressively began pursuing alternative fuels programs in fleet vehicles as a means to improve air quality. In addition to the successful conversions of vehicle fleets to alternative ...