When I was young I used to believe that "traffic light changer" was an actual occupation, and it involved sitting in a little office underground at an intersection, with something like a submarine telescope which stuck out of the ground above you so you could watch the traffic and know when to switch the light from red to green.
A childhood belief about traffic lights

others believed things like this
- that the green traffic light turned blue when it was off— Kriket Evens
- I used to belive that there was a god living in every traffic light, controlling the traffic!— Sukhi
- My dad could change a traffic light from red to green using our garage door opener.Anon
- I used to believe that little men (or women) slept & went to work in every traffic light — Kelly bulanek
- When i was little i always thought there were little men inside the traffic lights changing the light— Kiley
- I used to believe that the yellow light in traffic-lights meant Go Faster!— M. L. E.