Here’s what it means if you see a blue stop sign

Heck, even a toddler can tell you that stop signs are red. That’s because since the 1950s, red has been the required background color for all government-regulated stop signs in the United States. But ...

Here’s what it means if you see green lights on a car

Red lights are for fire trucks, and blue means law enforcement. But what about green lights on a car? We have the answer.