Red, yellow and green have been our standard stoplight colors for over a century. But researchers in North Carolina suggest a fourth color could help driverless cars and those steered by humans share the road.
We've had stoplights to direct us and our vehicles through intersections for around a century now. A design studio in Moscow has a concept for a high-tech refresh of stoplight technology.
Nobody likes being stuck at a stoplight, but before there were systems in place to make drivers take turns, the roads were not good. Here are a few of the inventions that helped us (mostly) stop crashing into each other.
