通过采用MCS—51系列单片机设计十字路口交通灯控制系统，实现系统功能：分东西道和南北道，设东西道为A道，南北道为B道。规定：A道放行时间为90秒，B道放行60秒；绿灯放行，红灯停止；绿灯转红灯时，黄灯亮2秒钟-Through the use of MCS-51 series MCU intersection traffic light control system design, system functions: Road and South Road sub things, set things Road to A Avenue, North-South Road as a B road. Requirements: A Road clearance time is 90 seconds, B Road, released 60 seconds　the green light, red light stop　green light turn red light, yellow light for 2 seconds