California on Tuesday authorized Google’s self-driving cars to be road worthy.

Gov. Jerry Brown signed the autonomous-vehicles bill into law beside Google co-founder Sergey Brin at Google’s headquarters in Mountain View, California.

The law is set to establish safety procedures and requirements to recognize the road-readiness of the vehicles. The bill had overwhelmingly passed the State Legislature. Google says they are safer because the computerized smart cars eliminate human error. Besides at the forefront of automobile innovation, Google says the cars are also more fuel efficient due to its driving efficiency.

Google has been testing the driverless cars for over two years.  It combines different technologies including radar sensors in front, video cameras scanning the surroundings, plus various sensors and artificial-intelligence software to assist in steering. The project is directed by Sebastian Thrun, a co-founder of Google Street View.

Besides California, Nevada also has legalized the driverless car. Google has been testing the cars in Nevada as well as in California.

In testing, the cars have accumulated more than 300,000 driving miles with 50,000 of those miles completely driverless. In testing, there was one minor accident, a fender bender, while a human was in control.

Google’s Brin hopes to see self-driving cars for sale in a few years. But first many legal and technical problems need to be worked out before any large number of self-drive cars are on the road.

Google’s first test vehicle was the Toyota Prius Hybrid before they added a Lexus SUV for testing on more difficult terrain.