DETROIT—The federal government’s highway safety agency agrees with Google: Computers that will control cars of the future can be considered their driver.
The redefinition of “driver” is an important break for Google and a big step toward getting self-driving cars to the public. But the company still has a long journey ahead before the cars without steering wheels or pedals arrive in great numbers.

In this May 13, 2014 file photo, a Google self-driving car goes on a test drive near the Computer History Museum in Mountain View, Calif. AP Photo/Eric Risberg