Red is used exclusively for regulatory road signs prohibiting doing something. So, a stop sign is red because you are ...

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. No Passing ...

KNOX COUNTY, Tenn. — Traffic signs help guide drivers safely through intersections, neighborhoods and construction zones. But few people stop to consider where those signs come from — or who’s behind ...