Google's prototype relies on built-in sensors and a software system to safely maneuver the vehicle. "We took a look from the ground up of what a self-driving car would look like," Brin said.

The goal of the project is for self-driving cars to be "significantly" safer than human-driven cars in a few years, Brin said. He said that that the project has experienced no crashes during testing, but the cars only operate at speeds of around 25 miles per hour, which gives them more time to react to obstacles.

Google's self-driving car is an ambitious project that hopes to end human error behind the wheel with a very Googley solution: software. The tech titan's robo-cars have logged more than 700,000 miles since it began working on the vehicles in 2009. Google expects to have them ready for public use between 2017 and 2020.

While Google has been at the forefront of developing and testing self-driving technologies, it's not alone in its driverless vision for the future. Nissan, General Motors, and automotive supplier Continental expect self-driving cars on the road by 2020. Ford Motor Co. has unveiled a self-driving prototype car.

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Source : http://www.cnet.com