1. Designing a traffic light controller for intersections, the requirements are as follows: Let the red, yellow and green lights in the north and south directions be r, y and G respectively; the red, yellow and green lights in the East and west directions are R, Y and G respectively, which meet the working flow of Figure 1 and can work concurrently: g (R)r (G). The yellow light is used to prompt the green light to turn into a red light or a green light to turn into a red light.

Filename	Size	Update
交通灯.ms12	495517	2019-07-04

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