Uber's launching self-driving cars for the San Francisco public today

Uber riders in San Francisco will be greeted with self-driving cars from today, after the etaxi giant announced an expansion of its autonomous vehicle program. Uber has been testing self-driving cars in the wild for a while, but back in September the company opened things up to the public for the first time via a trial in Pittsburgh. Now, it's San Francisco's turn, with a fleet of Volvo XC90 autonomous vehicles being made available through the UberX service. There is no specific way of requesting a self-driving car -- if one's available, you may be allocated one. And the cars aren't completely human-free -- there are operators in the back- and front-seat "monitoring" things to intervene if need be.