When a highway tunnel is experiencing traffic congestion in the form of vehicles queuing, the traffic police department should take measures such as preventing vehicles from entering, guiding and diverting the traffic according to specific situations and issue the information of traffic jam in a timely way.
当公路隧道内出现车辆排队滞留时，公安交警部门应视情况采取禁止车辆驶入、疏导分流等措施，并及时公布拥堵信息。