Google's engineers had to test car driven automatically in the streets of California.
The cars were using the camera on its roof, radar sensors, and lasers to see other traffic users, as announced Google software engineer, Sebastian Thrun.
Indeed there are still drivers who are trained in the car and also a software expert, who is ready to take over control if necessary.
Goggle hope that their cars will be going to reduce traffic density and reduce the rate of traffic accidents.
In the company's official blog, Thrun said the cars that run themselves so far been explored tersebDetailsut 140 000 miles of streets.
They also have crossed the bridge of San Francisco's famous Golden Gate, to overcome the up and down the street, across from a Google office to another office, and around Lake Tahoe in one go.
