Traffic network design problem attempts to find the optimal network expansion policies under budget constraints. This can be formulated as a bi-level optimization problem: the upper level determines the optimal link capacity expansion vector and the lower level determines the link flows subject to user equilibrium conditions. However, in the context of environmental concerns, driver's route choice includes travel time as well as emission pricing. This study is an attempt to solve network design problem when the user is environment cautious. The problem is formulated as a bi-level continuous network design problem with the upper level problem determines the optimal link capacity expansions subject to user travel behavior. This behavior is represented in the lower level using the classical Wardropian user equilibrium principles. The upper level problem is an example of system optimum assignment and can be solved using any efficient optimization algorithms. Genetic Algorithm is used because of its modeling simplicity. The upper level will give a trial capacity expansion vector and will be translated into new network capacities. This then invokes the lower level with these new link capacities and the output is a vector of link flows which are passed to upper level. The upper level then computes the objective function and GA operators are applied to get a new capacity expansion vector and the process is repeated till convergence. The model is first applied to an example network and the optimum results are shown. Finally the model is applied to a large case study network and the results are presented.
Continuous Network Design with Emission Pricing as a Bi-Level Optimization Problem
Ninth International Conference on Applications of Advanced Technology in Transportation (AATT) ; 2006 ; Chicago, Illinois, United States
04.08.2006
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Continuous Network Design with Emission Pricing as a Bi-Level Optimization Problem
British Library Conference Proceedings | 2005
|A Competitive Network Design Problem with Pricing
Online Contents | 1993
|Dynamic Continuous Network Design Problem
Transportation Research Record | 2006
|Robust Dynamic Continuous Network Design Problem
Transportation Research Record | 2007
|Robust Dynamic Continuous Network Design Problem
Online Contents | 2007
|