根据城市的十字路口各部门和在不同时间的交通流量，智能交通灯控制方案，并给出基于VHDL语言，采用层次结构设计的QuartusⅡ模拟思想。-According to the different branches of city’s intersections and the traffic flow at different times, the program of intelligent traffic light controller based on VHDL is given and s