Description: 1) A Road and B Road have requested the passage of vehicles, A, B Road, alternately release. A Road released five minutes (when debugging to 5 seconds), B Road, released four minutes (when debug changed to 4 seconds). 2) together with a car and another car-free (experiment with switch control K0 and K1), traffic light control system can be released immediately so that the lane. 3) called for the adoption of emergency vehicles, the system must be able to prohibit ordinary vehicles, A, B Road are red lights, emergency vehicles from K2 analog switch. 4) is converted to green when the red light yellow light 1 second.
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