因而应谨慎采用机动车交通信号灯倒计时装置，并应辅以绿灯间隔时间调整、交通安全宣传教育和明确交通规则等措施。
So, the timing signal should be set cautiously with the aid of other measures such as adjusting the interval duration, propaganda of traffic safety and rules.
在城市主干道约500个红绿灯路口安装了盲人过街音响信号装置，350个路口安装了行人灯绿闪倒计时器。
All of them are paved with blind paths and stone ramps. 500 main intersections are installed with sound devices to guide the blinds. 350 intersections are installed with green light count down device.
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