Description: This procedure realize at the crossroads of the analog control traffic lights. Assuming that there is a crossroads, divided into north and south and east-west road junctions junctions. Traffic lights at the crossroads of the changes of requirements: (1) the green light at the junction of North and South, East and West at the junction of the red light at the same time 30 seconds, and shows the countdown. (2) North and South at the junction of several blinking yellow light, while things continue to light the red light intersection. (3) red lights at the junction of North and South, East and West at the junction of bright green light at the same time 20 seconds, and shows the countdown. (4) north-south junction of the red light continues to shine, at the same time things blinking yellow light at the junction of several. (5) to (1) repeat. If the keyboard input
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