regulatory traffic sign

例句：

1. 1. The traffic police are required to display this regulatory traffic sign at all times.
   交通警察被要求在任何时候展示这个监管交通标志。
2. 2. This regulatory traffic sign is designed to alert drivers of potential hazards on the road.
   这个监管交通标志旨在警告驾驶员道路上的潜在危险。
3. 3.The driver was fined for failing to observe this regulatory traffic sign, which prohibits passing cars from turning left in front of a school bus.
   司机因未遵守这一监管交通标志而被罚款，该标志禁止在公交车前方转弯的车辆从左侧通过。