MOUNTAIN VIEW, CA - FEBRUARY 02:  U.S. Transportation Secretary Anthony Foxx (R) and Google Chairman Eric Schmidt (L) walk around a Google self-driving car at the Google headquarters on February 2, 2015 in Mountain View, California.  U.S. Transportation Secretary Anthony Foxx joined Google Chairman Eric Schmidt for a fireside chat where he unveiled Beyond Traffic, a new analysis from the U.S. Department of Transportation that anticipates the trends and choices facing our transportation system over the next three decades.  (Photo by Justin Sullivan/Getty Images)

Autonomous Cars

Some of the world's biggest companies, including GM, Google, BMW, and Volvo, are investing heavily in technologies designed to get humans out from behind the wheel.