Here's Why America's Highway Traffic Signs Are Green

US Route 20 starts in Boston, Massachusetts, and ends in Newport, Oregon. It's America's longest highway, measuring approximately 3,365 miles. However, nobody needs to drive for almost four days to start questioning the color of the traffic signs. Sticking to the speed limit while looking at what's ahead is enough. Let's unlock that mystery. Believe it or not, highway traffic signs haven't always been green everyw... (continue reading...)