The video shows Mr Mahan sitting in the driver’s seat as the car steers itself using a sensors to position itself safely in traffic and decide when to exit junctions.  The automatic car takes him to a Taco Bell drive-through restaurant and a dry cleaners as Mahan jokes that “this is some of the best driving I’ve ever done.”

A self-driving car would change the life of people with limited mobility. “It would give me the independence and the flexibility to go to the places I both want to go and need to go, when I need to do those things,” Mahan says in the video.

Google, which posted the video on its Google+ account, first introduced the concept of the self-driving car in 2010. After safely completing more than 200,000 miles of computer-led driving, the company say they are getting closer to producing the car of the future.

There are currently no laws in California about the use of self-driving vehicles. Police have allowed the test drives to go ahead as long as a licensed driver is in the car and able to take manual control in an emergency.