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Steady checkered lights denote command and control vehicles – these are red and white for fire (one of the few situations where a forward-facing red light may be shown), blue and white for police and green and white for ambulance, [93] and are often fitted in the middle of the light bar. Civil enforcement vehicles also use red lights in ...
His design was the first to include an amber 'caution' light along with red and green lights. [14] Potts was Superintendent of Signals for the Police Department of Detroit. He installed automatic four-way, three-colour traffic lights in 15 towers across Detroit in 1921.
In New Zealand, where they drive on the left, when a road is given a green light from an all direction stop, a red arrow can continue to display to turning traffic, holding traffic back while the pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).
Traffic light in Chelyabinsk, Russia showing a green light with a digital countdown (in the centre aspect) of the time left until the signal switches to amber. Red light running occurs when a motorist enters a junction any time after the signal light turns red unless a legal turn on red manoeuvre is completed. [3]
The signal was 22 feet (6.7 m) high. The light was called the semaphore and had arms that would extend horizontally that commanded drivers to "Stop" and then the arms would lower to a 45 degrees angle to tell drivers to proceed with "Caution". At night a red light would command "Stop" and a green light would mean use "Caution". [3]
Traditional red and green ornaments on a Christmas tree. Aside from being beautiful, the colors of the holiday season have some significance, some culturally and some simply commercially.
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