“Wouldn’t some owners designate red for “stop,” others green or blue, etc.? Wouldn’t some roads be used on the right- hand side and others on the left? Such questions are absurd. Obviously, it would be to the interest of all road owners to have uniform rules in these matters, so that road traffic could mesh smoothly and without difficulty. Any maverick road owner who insisted on a left- hand drive or green for “stop” instead of “go” would soon find himself with numerous accidents, and the disappearance of customers and users.”