I believed that the interstate road signs that said "Exit Only" meant there was no way to get back onto the highway.
A childhood belief about road signs

others believed things like this
- No passing zones on the highway. How come we just kep passing those signs? — Colleen
- I used to beleive that road signs grew out of the ground.— Tiana
- I used to see "End Road Work" signs, and thought they were a sort of protest.— Sebastian
- I used to believe that the sky had stop lights and road signs floating about for the airplanes.
— LoonaSM's - When I was little, I used to believe that deer could only cross the road at the deer crossing signs. — Shellie
- When I was a kid, I used to believe that the "ped x-ing" signs meant "pediatrician crossing."— Jessica