Trucks as a percentage of total U.S. light-duty vehicles increased from 16.4% in 1980 to 44.9% in 2004, the highest…

The number of people carpooling to work has decreased from 19.1 million people in 1980 to just 14.4 million in…

Fewer young Americans are getting their driver's licenses. In 1983, 68.9% of 17-year-olds had driver's licenses, but by 2010, only…