Sometimes it’s better to ask permission than forgiveness. The ride-hailing firm had been running a trial of autonomous cars — allowing San Francisco passengers to opt for self-driving mode — and it argued that because the vehicles had safety drivers they didn’t require special permits. It turns out the DMV disagreed and threatened legal action. So Uber, which previously tested autonomous cars in Pittsburgh, has halted the California trial run. It’s not clear if they’ll restart the test down the road or move to another state.