California has ordered Uber to remove self-driving vehicles from the streets of San Francisco, after the car service company defied regulators and began a pilot program that saw the automated cars break traffic laws and endanger lives. Sixteen of the company’s high-tech vehicles had their registrations revoked on Wednesday, after they were spotted running red lights, blocking intersections and turning illegally across bike lanes. Uber had already been ordered not to deploy the self-driving cars, but defied the order in a move that the company called an “important issue of principle.”