道路标志信号

例句：

1. 1.The traffic police are responsible for enforcing the rules of the road.
   交通警察负责执行道路交通规则。
2. 2.The road sign is a warning to drivers to slow down.
   道路标志是对司机的警告，提醒他们减速。
3. 3. The red light is a signal that cars must stop.
   红灯是一个信号，要求汽车必须停车。