Dynamic traffic congestion modeling: With an application to Seoul

Kabsung Kim, University of Pennsylvania


Equilibrium queuing patterns are analyzed in the context of a network which has three bottlenecks with two origins and a single destination. The individual in the model chooses his/her departure time as well as route, considering the tradeoff between travel time and schedule delay. At equilibrium, no one can alter his/her departure time and route in the sense of the Wardrop principle. Four different configurations are analyzed associated with the capacities of the upstream and the downstream bottlenecks and the queuing start times at both bottlenecks. Queuing periods at three bottlenecks are determined in the model. It is found that a queue does not occur at the upstream since the departure rate is always equal to its capacity level at equilibrium. The route choice is determined by the relationships among the capacities of the downstream and the alternate route, the number of individuals from both origins, the fixed travel time of three links, and the parameter values. The sensitivities of the exogenous variables are also analyzed. Traffic congestion in Seoul is analyzed by the simulator, CONTRAM. It is found that queuing time accounts for over half of the total journey time in the network. The overall network speed and congestion index show that traffic congestion was very serious in Seoul in 1987. Five transportation policy scenarios are proposed and evaluated. It is found that transportation system management (TSM) actions such as reversible lanes and zonal restrictions are very effective in easing traffic congestion in the short run. It is recommended to expand network capacity on the congested roads and the alternate mode, subway, in the long run. Also, it is verified that flexible work scheduling is very effective to ease traffic congestion. As a result, the existing network capacity can be utilized.

Subject Area

Urban planning|Area planning & development|Transportation

Recommended Citation

Kim, Kabsung, "Dynamic traffic congestion modeling: With an application to Seoul" (1995). Dissertations available from ProQuest. AAI9532219.