Federal Hours-of-Service law caps a human trucker at 11 hours behind the wheel -- a real safety rule against fatigue, not a formality. Aurora's driverless trucks already run a 1,000-mile Texas-to-Arizona route that takes 15 hours straight through, not because the machine drives better, but because the safety law protecting the human never applied to it. Trucking supports 8.4 million jobs in a trade that takes 79 days to get licensed for.