reverse signal

例句：

1. 1. The car's reverse signal is flashing.
   汽车的反向信号灯正在闪烁。
2. 2. The police used the reverse signal to divert traffic.
   警方使用反向信号来引导交通。
3. 3. The engineer reversed the signal to allow more people to cross the road.
   工程师反转了信号，以便让更多人过马路。