Had similar a long time ago whilst I watched some workmen working on the traffic lights of a 6 way junction. It was being controlled by temporary lights, and th

Had similar a long time ago whilst I watched some workmen working on the traffic lights of a 6 way junction. It was being controlled by temporary lights, and they were winding up the job. One guy with a laptop plugged into the central cabinet, and another over at the control box for the temporary lights. Temporary guy fiddled with something, put all the lights to red, and eventually everything came to a halt. Big thumbs up from him, and the cabinet guy pressed what seemed to be 'Enter' on the laptop, at which point the main lights all lit red, and then began the cycle. We take shutdowns and startups for granted in our world, but we also expect traffic lights to work 24/7. I'd just witnessed the crossover of these two expectations, and was fascinated :-)