Self-driving cars will become the norm in the next twenty years, leading to a ban on human drivers, according to Tesla founder Elon Musk.

Speaking at the Nvidia GPU Technology Conference in San Jose, California, Musk said it would take two decades to replace the two billion cars currently on the road with self-driving vehicles. The UK has already given the green light for such vehicles to be tested on roads, but when they're finally adopted, autonomous cars would spell the end of a person getting behind the wheel, the tech entrepreneur claimed.

"In the distant future, I think people may outlaw driving cars because it's too dangerous," Musk said, as quoted by The Verge. "You can't have a person driving a two-ton death machine."

Musk said that Tesla was keen to develop its electric cars to drive themselves, with the car maker already having unveiled an autopilot mode for its Model S vehicles. The mode allows cars to change lanes and park themselves, and Musk revealed plans are underway to have a car that was "90 per cent capable of autopilot."