1. Port management agencies have strict hygiene and food safety requirements to ensure the hygiene conditions and the quality of food supply in port areas. It is forbidden to sell lunch boxes to avoid food hygiene problems and potential health risks.

2. The port area has specific environmental protection policies and requirements. The purpose of banning the sale of lunch boxes is to reduce the garbage and pollution problems in the port area, especially in the treatment and cleaning of food packaging garbage.

3. In order to maintain the order and safety of the port area, it is forbidden to engage in commercial activities in specific areas, so as to prevent congestion and hinder the transportation of goods and ensure the smooth operation of the port.