Find out more about Google's driver-less experiments after the break.
The cars (all Toyota Priuses) used video cameras to "see" other cars around them, and relied on Google's huge database of map and traffic information to navigate themselves from point A (Google's northern California headquarters) to point B (Google's southern California offices). The cars crossed San Francisco's Golden Gate Bridge, navigated California's famously windy and scenic Route 1, and even drove straight down Hollywood Boulevard.
In an official blog post, Google says that the aim of this project was to "help prevent traffic accidents, free up people’s time and reduce carbon emissions by fundamentally changing car use." It also believes this technology could cut the number of worldwide deaths by car accidents — currently at 1.2 million — in half.