Changes of traffic lights crossroads requirements: (1) North-South crossing the green light, red light intersection at the same time something light about 30 seconds. (2) North and South junctions yellow light flashes several times while crossing the red light continues to light things. (3) North-South crossing the red light, green light while crossing something light about 30 seconds. (4) North-South crossing red lights continue to shine, while the yellow light is flashing something a number of junctions. (5) change (1) repeat. By connecting the seven-segment digital tube remaining time dynamic display of green light

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