indicator maintaining plate distance piece

例句：

1. 1.The traffic policeman used a traffic indicator to warn drivers about the upcoming construction.
   交通警察使用一个交通指示器来警告司机关于即将到来的施工。
2. 2. The new road sign indicates that the next intersection is coming up.
   新的路标表明下一个路口即将出现。
3. 3.The company's logo is an indicator of its corporate culture.
   公司的商标是其企业文化的一个指示。