As a 3 year old, I always believed that the little "no right turn" signs on traffic islands meant "no boomerangs". Being from Australia, this seemed perfectly logical until I was about five or six and my dad explained what they really meant.
A childhood belief about road signs

others believed things like this
- 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
- i used to believe that the no outlet signs meant that noone in that section of the street had electricityAnon
- i used to believe that red yellow and green meant "ready, set, Go!" on traffic lights..— cabagona
- I used to believe that the yellow light in traffic-lights meant Go Faster!— M. L. E.
- I used to think that "No standing signs" meant that you weren't allowed to actually stand in the area!Anon