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

Q: Road signs in construction zones are orange. Aside from color, some look like “mandatory” black-and-white signs, while ...

Yellow speed limit signs, such as this one on Blue Ridge Road in Raleigh, are called “advisory speed limit signs,” according to the Federal Highway Administration. They are posted for “a small portion ...

Traffic signs have to communicate crucial information quickly and simply, to anyone who might be on the road. They use letters and numbers to lay out information in plain language but they also use ...