The Trump administration has taken a hands-off approach to regulating self-driving cars, but on Friday, federal regulators decided that one self-driving car project had gone too far. In a sharply worded statement, the National Highway Traffic Safety Administration said it has ordered the French transportation company Transdev to stop transporting schoolchildren in a self-driving vehicle in Florida. Transdev's pilot project in Babcock Ranch, a planned community, was quite modest. On Fridays, Transdev's electric shuttle would take a group of elementary-aged children to school, then take them home later in the day. The vehicle had a safety driver on board.