1. After the address, write a polite introduction explaining the purpose and background of writing. After the introduction, enter the body part and reply to the complaints received.

2. Briefly describe the situation of privately-built piles, indicating that the traffic police force has launched an investigation on this issue.

3. Briefly describe the situation of privately-built piles, indicating that the traffic police force has launched an investigation on this issue.

4. At the end of the reply, thank you politely, and emphasize once again that the traffic police team attaches importance to traffic safety.