Regulations governing Google’s experimental self-driving cars will come into effect on California’s roads starting 16 September.
Google has many test hours under the car’s belt but they have been tested only once by a government body. They were tested by the state of Nevada Department of Motor Vehicles (DMV) in May 2012.
They used a Toyota Prius and it passed the test almost immediately. Google chose the test route, testing conditions and set limits on the road and weather conditions that the vehicle could encounter. And for safety the engineers could take control of the car when needed, in the case of the test this occurred twice during the drive.
The car’s performance was tested in common situations. Determining whether it operated fully autonomously, four-way stops, pedestrian stops, merging, obeying the speed limit, acceleration and deceleration and others.
The car was not tested in roundabout and rail road crossings. The system is still being developed to handle those situations.
The car needed manual operations around a construction, it was confused in the many obstacles and it also needed help with a few turns.
Following the Las Vegas test, the Prius was put through its paces again in the state capital, Carson City. A DMV committee then met and approved the country’s first self-driving vehicle testing license.[SOURCE](http://spectrum.ieee.org/transportation/advanced-cars/how-googles-autonomous-car-passed-the-first-us-state-selfdriving-test#.VBEBOEt1Pj4.reddit)