比如，可以利用闪烁的车头灯和车尾灯光传达车速以及刹车信号给其他车辆，防止车辆间的碰撞。
For example, the subtle flickering of car headlights and tail-lights could be used to transmit speed and braking information to other vehicles, to help prevent collisions.
简单来说，中继器将正常情况下收到的信号，和数据碰撞时产生的拥塞信号重复发送到所有的端口。
The hub or repeater simply repeats an incoming signal on all ports and also sends the jam signal to all ports if there’s a collision.
碰撞发生于因信号设备故障采用人工调度的时段，上海申通地铁有限公司在一份声明中称。
The crash happened while controllers were running operations using a manual system following an equipment failure, Shanghai Shentong Metro Group Co. said in a statement.
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