On the highway between San Francisco and Los Angeles in the United States, a Toyota Prius hybrid electric vehicle with a video camera installed on the roof has recently appeared. Although there is a person sitting in the driver's seat, no one is driving. This is an autonomous vehicle that Google is secretly developing, using artificial intelligence software to sense various things around the car and simulate the operation of a real person driving. At present, Google has 7 such test vehicles, one of which has driven 140000 miles without any human intervention, and the other has even traveled on one of the steep and winding roads in the United States - Lombard Street in San Francisco. It is reported that these vehicles have only been involved in one car accident, and were rear ended by a vehicle behind them while parked at a traffic light.