“开绿灯”英语怎么说？

众所周知，交通信号灯（traffic lights/ traffic signals）有“红灯停，绿灯行（The green light allows traffic to proceed. The red signal prohibits any traffic from proceeding.）”之说。 “开绿灯”指交通路口打开准许行人车辆通过的信号（g...