i used to believe that when i saw the signs "Speed Limit Radar Enforced" it meant that, at the police station there was a cop looking at a really big radar screen of the city, with blinking lights for each car and could tell which ones where speeding and would then use the radio to call someone out to stop you.
A childhood belief about police

others believed things like this
- I thought that if you were speeding and hit a speed bump, it would cause your car to fly into the air.— SeñorChaCha
- I used to believe that the sky had stop lights and road signs floating about for the airplanes.
— LoonaSM's - I used to think that Mice controlled the Stop lights and crosswalk signs.Anon
- I thought the song "Karma Police" was actually saying "call the police" before I learned the title— Alberto Richardson
- Having seen enough red octagonal STOP signs in my time, I used to look out for green circular GO signs.— Gary
- I believed that traffic lights had police officers inside them, turning the lights on and off...— CrowHeart