1)automatic highway crossing signal lamp,自动道口信号灯2)automatic signal lamp,自动信号灯3)electric points lamp,电动道岔信号灯4)sutomatic light signal,自动灯光信号5)pre signal,车道信号灯6)points lamp,points signal lamp,switch signal lamp,道岔信号灯
用法和例句
A sort of bus priority measure applied in signal intersections is set out, where bus advance area and pre signals are installed.