According to the website TrafficTechnologyToday, some folks are suggesting a fourth, 'white' light to be a part of our ...
They might be vertical, they might be horizontal, but otherwise, traffic lights have hardly changed in a hundred years. Red means stop, yellow means slow down, and green means go, a universal code ...
Today, almost every country follows this three-colour traffic light system. International road safety agreements and vehicle design standards are built around it.
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