Road signs are a constant part of the driving experience, most packed with numbers, letters, and regulatory instructions. But ...

Most road signs are easy to understand, as they're pretty literal. Do Not Enter simply means to stay away from that certain area. Speed Limit 55 tells you that you shouldn't go over 55mph.

The signs use some choice words for drivers, asking them to put their cell phones down, avoid distracted driving and obey the posted speed limit. Boulder Police said they don't know who posted the ...