New: semaphoresignallingAll contenthive-129948hive-196917krzzanhive-183959steemphotographyhive-180932hive-185836uncommonlabhive-150122bitcoinhive-183397hive-144064hive-145157hive-166405hive-109690lifekrsuccesshive-139150hive-188619hive-101145hive-184714hive-150943cryptoTrendingNewHotLikersalexanderrogge (39)in trafficsignal • 5 months agoA brief history of the traffic light and why we need a new colourAl Jazeera - A brief history of the traffic light and why we need a new colour: #TrafficSignal #TrafficLight #TrafficSafety #Throughput #Efficiency #ParliamentSquare #London #WilliamPott…