And some of them caused serious deaths or injuries.
However, there were a considerable amount of metro terrorist attacks happened in the metro stations around the world in the past decades. In some cities with large population, metro system usually plays an important role in public transportation, and some metro stations can become very crowded in rush hours.
By adding security check machines and ticket vending machines at the entrances with high passenger traffic demands, the congestion near these entrances could be greatly reduced. Results show that when security checks are set at each entrance of the station being studied, the flow rate of passengers entering the gate machine could be decreased by 49.4%~83.3%, which can cause serious congestion at the entrance during rush hours. In addition, possible improving measures such as adding security check machines and ticket vending machines were also modeled to test their effectiveness on reducing the congestion in the station. The congested areas in the station hall and possible causes were analyzed. By using the AnyLogic simulation software, the traffic characteristics of passenger flow under the scenarios with and without a security check were compared and discussed. In this study, metro station models were constructed using the building structure and passenger flow data of a realistic metro station in Guangzhou, China.
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How security check will impact the passenger flow and how to reduce the impact are questions that need to be addressed. However, the security check can also slow down the entering speed of passenger flow and lead to congestions that may affect passengers’ travel plans. There is no doubt that security check can help keep dangerous objects out of a metro station.
In order to ensure the safety of passengers using metro stations and staff working at them, some cities choose to set security checks at the entrances of metro stations.