On some midwest highways they use white signs with a bold black plus sign to indicate an upcoming intersection. My dad used to tell us this meant the road was positively charged. I could never find any negatively charged roads.
A childhood belief about road signs

others believed things like this
- I used to believe the Do Not Pass signs on the roads meant you were'nt aloud to pass the sign. I was 14.Anon
- i used to believe that the signs for curvy roads were for snake crossingsAnon
- I used to believe that the "no outlet" sign on roads was a warning to people driving electric cars.— c
- I thought the no overtaking sign meant that red cars cannot drive by black cars.— Helen
- I thought for the longest time that a No Standing traffic sign meant no person should stand near that sign.— Shannon
- I thought that old movies were black and white because the world was black and white then. — K