Until I was around 22 (yes, I know) I could never understand the signs on motorways that said "Slow Lorries". I thought there must be a depot of lorries which couldn't travel very fast. It was only when I mentioned this to one of my friends that she laughed and pointed out these signs were always at the bottom of hills!
A childhood belief about road signs

others believed things like this
- Having seen enough red octagonal STOP signs in my time, I used to look out for green circular GO signs.— Gary
- I used to see "End Road Work" signs, and thought they were a sort of protest.— Sebastian
- I thought the "To Let" signs on buildings meant they were public toilets.— Scottish Laddie
- Up until I was 17 I thought that 'no outlet' signs meant that the steet didn't have any streetlights.— Kelsey
- when I saw those prepare to meet thy god signs I thought they were beauty parlours for religous ladies only!— knuckles
- As a kid, I thought "No Outlet" signs meant the houses past that point didn't have any electrical outlets.— Julie