数电课程设计:交通灯⑴设计一个十字路口的交通灯控制电路，要求甲车道和乙车道两条交叉道路上的车辆交替运行，甲车道（主干道）放行45秒，乙车道（支干道）通行时间为25秒；

⑵在每次由绿灯变成红灯的转换过程中间，要亮5秒的黄灯作为过度，以使行使中的车辆有时间停到禁止线以外；

-The number of electrical curriculum design: the design of a traffic light ⑴ crossroads traffic lights control circuit requires a two-lane carriageway and B crossover vehicles on the road to the turn to run, a lane (trunk) release of 45 seconds, B Lane (trunk branch) passage time for 25 seconds　⑵ at every red light from green into the middle of the conversion process, it is necessary to light five seconds over the yellow light as to enable the exercise of the vehicles have time to stop to prohibit outside line