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If You See a Traffic Light With Blue Instead of Green, This is What It Means
(Before we answer that, here's why our own traffic light colors are red, yellow, and green.) That’s when you see things like ...
朝日新聞社4y
Smartphone app system tells blind people the color of traffic signals
The National Police Agency is moving to create a nationwide system based on a smartphone app that informs blind and visually impaired people the color of traffic signals at intersections. Noboru ...