Abstract
This paper describes a study that evaluated relative costs of alternate facility configurations to support an expanding Central Ohio Transit Authority (COTA) fleet. Each configuration was composed of a combination of the number, location, and capacity of garages. The complex procedures by which COTA operates are reviewed, and a conceptual model for estimating operating cost parameters is presented. Mathematical models are developed to estimate both deadheading and relief components of variable operating cost. A prescriptive model which determines optimal facility configuration and assignment of buses to garages is described. The methodology is used to evaluate cost trade-offs related to operating procedures, site locations, and economies of scale associated with garage capacity. Alternatives for time staging construction are also evaluated.
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