When I was little I use to believe that the highway signs "Park N Ride", for car pools, meant that there was a place to park ahead and go on carnival rides. I use to beg my parents to stop for the "carnival" and they would look at me as if I was crazy! I still get a kick out of those signs.
A childhood belief about road signs

others believed things like this
- I used to think that a "carnival barker" was a person who barks like a dog at a carnival.Anon
- Having seen enough red octagonal STOP signs in my time, I used to look out for green circular GO signs.— Gary
- No passing zones on the highway. How come we just kep passing those signs? — Colleen
- I used to believe that the sky had stop lights and road signs floating about for the airplanes.
— LoonaSM's - I used to think that Mice controlled the Stop lights and crosswalk signs.Anon
- When I was a kid, I used to believe that the "ped x-ing" signs meant "pediatrician crossing."— Jessica