Yeah, traffic lights were around before cars. I saw most of those, but many were probably in a PA museum, though many were scattered thru that state. Could you imagine being a cop standing in an intersection, in today’s traffic? That “go past the post” was a tide over from city cops. (MPs used to duplicate their street dance.) And, of course, many lenses had stop and go painted on them. (I had to ask dad why. He said it was for farmers who hadn’t been to town in 20 years.)
My favorite was the semaphore signal… a couple loud clangs (ala RR x-ing) as the semaphores were changing from STOP to GO. I remember the horizontal lights and the green/red ones, as well as the “grave post” stop signs. The PA town had switched to red lettering, to meet state requirements, but refused to replace with modern stop signs. One had been broken a couple days before, and it was the talk of the town. Would they give in or carve a new one?
There was even one that was a post in the intersection w/ a colored lens in each direction, yellow or red. The single center bulb “blinked” by a disk rotating inside. They said the bulb had burned for 30 years, replaced when a drunk saw the blinking yellow and fixated on it. At a gong, the lens head would rotate 90 degrees.
That Pass Eye Mirror… what a great idea.