With the economic development, the traffic flow fluctuates in time disciplinarian. According to the best Cyc formula, the red green light Cyc should change with traffic flow change.

• 随着经济的发展，许多路口的交通流量开始出现具有时间规律的波动，由最佳红绿灯最佳周期公式可知，红绿灯周期应随交通流量的变化而变化。