My wife for years after we were married believed that the "Frontage Road" on a road sign was the longest road. She always wondered how they were able to keep it as one road. (:-)
A childhood belief about road signs

others believed things like this
- I used to believe the "Yield" from the road sign was somebody's name.— julia
- i always thought that a DEAD END sign
as where they put all the road kill.
— pav - I used to think that we were breaking a law every time my mom passed a "Do Not Pass" sign on the road. — Kyra
- i used to think that the road sign "dangerous" was actually "dang-er-roos" a kind of bouncy marsupial— owen cash
- I believed the mosque down the road was Aladdin's castle, and my mum went along with it to keep me happy.— Elena
- I believed that the gap between the double yellow lines in the road was a special lane for motorcycles.— Joel