William Phelps Eno (June 3, 1858 – December 3, 1945) was an American businessman responsible for many of the earliest innovations in road safety and traffic control.
He is sometimes known as the "Father of traffic safety", despite never having learned to drive a car himself.
Among the innovations credited to Eno are traffic regulations, the stop sign, the pedestrian crosswalk, the traffic circle, the one-way street, the taxi stand, and pedestrian safety islands.