OPTIMAL MIXED BUS FLEET FOR URBAN OPERATIONS

Abstract

A model is developed for optimizing vehicle sizes on multiple route operations in bus service. The demand characteristics are specified with regular discrete distributions that can realistically represent the variations over time. The total operator and user cost, which does not include the capital cost of vehicles in one-size operations on one route or multiple routes, is minimized by using a classical analytic optimization. Total system cost, which includes the capital cost of buying vehicles in mixed-fleet operation on one route or multiple routes, is minimized by using the numerical method in which the multidimensional optimization algorithm is applied. The optimized variables, which could be decided sequentially, are vehicle sizes, optimal headways, and operating fleet size. Computer programs are designed for optimization and sensitivity analysis. Numerical examples are presented for one-size and mixed-fleet operation on one route and multiple routes with discrete demand periods.

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