Fall 2019
Cycles
The Fall 2019 issue of Washington State Magazine centers on cycles: lives of amphibians, bicycling, traffic signals, and the academic years at Washington State University. » More ...
Traffic signals
Fall 2019
Smart signals
Less snarl and more green with smart traffic signals and connected vehicles, thanks to research by Washington State University's civil and environmental engineers » More ...
Fall 2019
Traffic signals: A brief history
Before automobiles even swarmed over the roads and streets, there was a need to control traffic to avoid accidents and keep vehicles moving smoothly.
The current systems have developed over more than a century, and they’re poised to change once again as vehicles become more connected and traffic control moves toward AI and complex computer-driven systems.
A signal history
December 10, 1868 — The first gas-lit traffic lights were installed outside the Houses of Parliament in London. Proposed by British railway engineer J.P. Knight to control the traffic of horse carriages, gas lights were manually controlled by a police officer using semaphore arms. … » More …