New: semaphore

alexanderrogge (39)in trafficsignal • 8 months ago
A brief history of the traffic light and why we need a new colour
Al Jazeera - A brief history of the traffic light and why we need a new colour: #TrafficSignal #TrafficLight #TrafficSafety #Throughput #Efficiency #ParliamentSquare #London #WilliamPott…
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A brief history of the traffic light and why we need a new colour