I used to think that the Australian road sign "No Through Road" meant that you were only allowed in that street if you lived there or were visiting someone you knew. It was a few years later I learned that it just meant it didn't comeout into another street.
A childhood belief about road signs

others believed things like this
- my mom believed when she was little that a street sign that said don't walk meant you better run.— Sara Mclen
- I used to believe a dead end sign meant there was a graveyard at the end of the street or zombies — Still Out There
- I thought that the "don't walk" sign at crosswalks meant to run across the street as quickly as possible!— richard
- I used to believe that a street sign that read "Dead End" meant that there were dead people buried there.Anon
- i used to believe that the no outlet signs meant that noone in that section of the street had electricityAnon
- I used to believe the "Yield" from the road sign was somebody's name.— julia