My younger sisters used to believe that the "slippery when wet" road signs meant that snakes were following your car
A childhood belief about road signs

others believed things like this
- 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
- I thought the "To Let" signs on buildings meant they were public toilets.— Scottish Laddie