Google announced a new phase of its self-driving car project Tuesday. The test vehicles, of which there are "about a dozen on the road at any given time," have so far logged 300,000 miles of road testing without a single accident under computer control. In the next phase of testing, team members will start commuting to work solo, with the robot at the wheel.
Google also showed off a new vehicle type added to the program, the Lexus RX450h SUV. Now that the self-driving car software is comfortable in a variety of traffic conditions, the next phase will test snowy roads, temporary construction signals and other unusual terrain.