It has a fixed \"red light-green light\" conversion interval and switches automatically. They are generally composed of three parts: \"pass and prohibit time control display, red, yellow and green three-color signal lights and direction indicator lights\". In the pass and prohibit time control display of traffic lights, it is usually either 50 seconds each in the east-west and north-south directions; or according to traffic rules, 60 seconds in the east-west direction and 40 seconds in the north-south direction, and the time control is fixed. The time control display of traffic lights is pre-\"solidified\" in the single-chip microcomputer with a fixed time value, and each time it only changes alternately at a certain period.
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