Roadside signs wired to traffic lights can help get the message across a couple hundred metres from a junction, but such signs are expensive, and have not been widely deployed.
连接到信号灯的路边标识能在距离路口数百米处帮忙提供信息，但是这样的标识除了价格高昂之外，也未被广泛部署。
Roadside signs wired to traffic lights can help get the message across a couple hundred metres from a junction, but such signs are expensive, and have not been widely deployed.
连接到信号灯的路边标识能在距离路口数百米处帮忙提供信息，但是这样的标识除了价格高昂之外，也未被广泛部署。
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