According to Zhihu’s inquiry, the traffic police and criminal investigators have their own division of labor and different responsibilities when handling cases. The main responsibilities of the traffic police are traffic order management, traffic accident investigation, traffic crime investigation, vehicle and driver management, etc. Criminal investigation is responsible for the investigation of criminal cases, including case filing, investigation, transfer, review and prosecution. Therefore, it is inappropriate for traffic police to seize criminal investigation cases, which involves legal procedures and law enforcement norms.