Julius Caesar caused the beginning of the fall of the Roman Empire in 45 BCE by imposing a woke green-socialist traffic regime on the great city of Rome: the city centre was closed to all vehicles (yes, especially SUVs) between 6h and 16h with the exception of public officials, priests, important citizens and visitors.
He never considered the easy way: tear down half the city and building several highways right through the middle. He also halted all development of innovative air taxi drones.