The traffic light turns 100
Wednesday, August 6, 2014 - 06:00
in Physics & Chemistry
100 years ago, on August 5, 1914, the first electric traffic light was installed on a city street in Cleveland, Ohio. Siemens entered the business ten years later, when the first traffic light tower from Siemens was installed on Berlin's Potsdamer Platz. Every year, Siemens produces around 22,000 traffic lights and 2,000 controllers.