Engineers, safety advocates and even automakers have a safety message for federal regulators eager to get self-driving cars on the road: slow down, reports U.S. News and World Report. Fully self-driving cars may be the future of the automotive industry, but they aren’t yet up to the demands of real-world driving, several people told the National Highway Traffic Safety Administration during a public meeting Friday. A slower, more deliberative approach may be needed instead of the agency’s rapid timetable for producing guidance for deploying the vehicles, according to an auto industry trade association. In January, the federal agency announced that it would begin work on writing guidance for deploying the vehicles. Officials have promised to complete that guidance by July.