I grew up in South Africa. Road names are marked as R10 or R60 etc. The currency in South Africa is the Rand (note the capital R), so I believed that the R10 or R60 signs I saw along the road, was the amount of the fine you would get if you were speeding on that road.
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 think that if you went to the end of a road marked "Dead End", somebody would try to kill you.— Spooky
- 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
- I believed the mosque down the road was Aladdin's castle, and my mum went along with it to keep me happy.— Elena