text: Registered motor vehicles in the US has flattened out, motor vehicles per capita has started to tick downward. From Levinson and Krizek (2015) The End of Traffic and the Future of Transport. http://davidlevinson.org/the-end-of-traffic-and-the-future-of-transport/ Figure 1.3 Source: US Census Bureau. Statistical Abstract of the United States and Historical Statistical Abstract of the United States http://www.census.gov/compendia/statab/past_years.html.