2010 RAND Corporation study on the cost of medical care attributed to California's failure to meet federal clean air standards.
2008 U.C. Berkeley study looking at the effect of carpool lanes on the number of person and vehicle hours traveled.
2008 Brown University paper examining the extent to which highways could explain rates of suburbanization within the U.S.
2006 paper by the Brookings Institution exploring the potential for bias in the structure of metropolitan planning organizations.
2009 paper by the Pew Internet and American Life Project on the rate of cell phone use while driving among American teenagers.
2008 paper by the Widener University School of Law on approaches for realizing the potential benefits of energy efficiency in the United States.
2010 report by the National Resource Council on the cost of the production and use of various forms of energy in the United States.
2005 Imperial College London review of the available scholarship on the impact of red-light cameras on automotive crashes.
2009 review by the World Bank of methods available for addressing transportation-sector emissions and congestion.