Red, yellow, green ... and white? Smarter vehicles could mean big changes for the traffic light
Smarter vehicles could mean some of the most dramatic changes for the traditional traffic signal since the yellow light was added more than a century ago
As cars and trucks get smarter and more connected, the humble lights that have controlled the flow of traffic for more than a century could also be on the cusp of a major transformation.
Researchers are exploring ways to use features in modern cars, such as GPS, to make traffic safer and more efficient. Eventually, the upgrades could do away entirely with the red, yellow and green lights of today, ceding control to driverless cars.
Henry Liu, a civil engineering professor who is leading a study through the University of Michigan, said the rollout of a new traffic signal system could be a lot closer than people realize.
“The pace of artificial intelligence progress is very fast, and I think it’s coming,” he said.
Traffic lights haven’t changed much in the U.S. over the years. Cleveland debuted what is considered the first “municipal traffic control system” in 1914, historian Megan Kate Nelson wrote for Smithsonian Magazine. Powered by the electricity from the city’s trolley line, engineer James Hodge’s invention featured two lights: red and green, the colors long used by railroads. A police officer sitting in a booth on the sidewalk had to flip a switch to change the signal.
A few years later, Detroit police officer William Potts is credited with adding the yellow light, though as a city employee he couldn’t patent it. By 1930, Nelson wrote, all major American cities and many smaller ones had at least one electrical traffic signal.
The advent of connected and automated vehicles, though, has presented a world of new possibilities for traffic signals.
Among those
Read more on abcnews.go.com
