Optimal Toll Ring Design with Spatial Equity Impact Constraint: an Evolutionary Approach
نویسنده
چکیده
This paper addresses the optimal design problem of toll ring in a general urban traffic network. This problem is categorised as a Mathematical Programming Problem with Equilibrium Constraints (MPEC) due to the implicit constraint of user equilibrium condition. In addition, the constraint on the topology of the combination of tolled links is imposed where the combination of tolled links must form a toll ring. A Genetic Algorithms (GA) approach used to tackle this topological constraint is based on Sumalee (2003). In this study, the approach is extended to take account of the potential spatial equity impact. The Gini coefficient, invented for the analysis of income distribution, is adopted as the measure of the equity impact. The toll ring design must ensure that the Gini coefficient is lower than the pre-specified criteria. The modified GA-based method is tested with a network of the city of Edinburgh in UK.
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