Most of us have grown up recognizing the classic red octagonal stop sign as an unmistakable symbol of caution and order on the road. So, when a blue stop sign appears, it can be both puzzling and ...

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 ...

Red means stop, green means go, blue means ... private property? Since the 1950s in the United States, red signposts have been the government-issued signal for traffic to stop. There were several ...