Wasn't it once upon a time, you had to stop your car, stop your engine, get out and fire a gun before crossing a corner? And further, there was a thing that in

Wasn't it once upon a time, you had to stop your car, stop your engine, get out and fire a gun before crossing a corner? And further, there was a thing that in some mountain passes muleteers had to fire their gun before crossing, and there's a story of two muleteers that fired at the same time (this story ignored speed of sound) and met halfway in the pass, and at a coin flip, had to decide who had to drop his mule down the cliff so the other could pass. The story was told from the perspective of the flip loser. Signals are hard.