In a blog post published Friday, Urmson says the cars will move at speeds no faster than 25 mph. A human test driver will also supervise each ride, taking over control if needed.
Google's self-driving cars are designed to work without permanent mechanisms such as a gas pedal or steering wheel. To comply with California state law, however, the cars have removable steering wheels and gas and accelerator pedals which human drivers will use if they take control.
These new prototype cars were manufactured by Google from scratch, but they are equipped with the same software that was used in its previous cars.
Earlier this week, Google revealed that the Lexus fleet has driven nearly a million miles on the road, and suffered 11 accidents since testing began over six years ago. None of the accidents were caused by Google's cars, according to Google, and none of the incidents caused injuries.
But before self-driving cars can start ferrying us to work, companies need figure out ethical issues (does it hit a deer or crash into the median?), improve basic driving functions, and work with governments on legislation to allow driverless cars on all roads.