Optimization framework for road network directed by unblocked reliability for given network topology and inelastic demand with stochastic user equilibrium
Part of : WSEAS transactions on business and economics ; Vol.6, No.6, 2009, pages 292-301
Issue:
Pages:
292-301
Abstract:
To provide more reliable service for drivers, it is necessary to establish an optimization frameworkin which a reliability index is adopted as a performance index to evaluate road networks. First, a modified fourlevelmodel of unblocked reliability (link, path, Origin-Destination pair and entire road network) is proposed, inwhich the unblocked reliabilities of the Origin-Destination pair and the entire road network are formulated bythe law of total probability when the unblocked reliability of path is a conditional probability. Then, a bi-levelprogram is established based on the new model of unblocked reliability since planners design the road networkand drivers respond the change in the road network. The objective function of the upper-level program is themaximized balance between the unblocked reliability of the entire road network and the road networkexpansion ratio which implies cost of improving the road network. The program equivalent of Stochastic UserEquilibrium is adopted as the lower-level model so as to achieve consistency in route choices and to model thecongestion effect in the road network. Next, a set of link capacity expansions is determined as a planningscheme by solving the bi-level program. This planning scheme not only improves the link of lower reliabilitybut also takes into account the performance of the Origin-Destination pair and the entire road network. Theproposed optimization framework is capable of improving the road network to its highest possible reliabilitylevel with a minimum scale of road network expansion.
Subject:
Subject (LC):
Keywords:
road network planning, bi-level program, unblocked reliability, stochastic user equilibrium, logit loading model
Notes:
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