The first traffic signals were not red, yellow and green. ... They measure the metal in cars as they drive over them, allowing the system to know that a car is there waiting for a green signal.

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 ...

What, you didn’t see any pedestrians out there rolling along on a green ball, Roger? In traffic-industry parlance, a green ball is the standard green light on a traffic signal as opposed to, say ...

Researchers say drivers might spend a lot less time waiting for the lights to change if cities added a fourth white traffic light colour to the familiar red, yellow, and green.

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 Jeff McMurray Saturday 11 May 2024 05:13 BST ...

Q. Hi Honk! For several weeks an electronic message board, at Serrano Road and Toledo Way in Lake Forest, has flashed, “YIELD TO PEDESTRIANS ON GREEN BALL.” Have many areas been having trouble ...

The 34 traffic signals in Birmingham were chosen because, like more than half of the signals nationwide, they’re set to a fixed-time schedule without any cameras or sensors to monitor congestion.

The 34 traffic signals in Birmingham were chosen because, like more than half of the signals nationwide, they’re set to a fixed-time schedule without any cameras or sensors to monitor congestion.