United States Department of Transportation
i
Investigating the Feasibility of Introducing Alternative Fuel Vehicles Into a Maintenance Fleet
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2021-06-01
[PDF-3.16 MB]
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Edition:Final Report Sept 2018 to June 2021
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Abstract:This study investigated the feasibility of introducing AFVs into the Utah Department of Transportation (UDOT) fleet, and a proper framework was devised and tested with real-world data. A mixed-integer linear model was adapted from the literature and modified, allowing UDOT to determine which type of vehicle needed to be purchased and salvaged each year to minimize the total ownership costs of the fleet. By implementing the Rolling Horizon (RH) optimization approach, this study addressed future market changes. A case study utilizing UDOT fleet data was investigated to evaluate the efficacy of the proposed framework. The fleet-related data were gathered from the “Networkfleet” website that stores UDOT fleet data. Vehicles utilized by UDOT from October 2018 to September 2019 were selected as the initial fleet composition. Information regarding other parameters influencing the calculation of life-cycle costs was obtained through published studies. A sensitivity analysis was conducted to showcase vehicle replacement decisions for different fuel price scenarios, addressing possible future cost fluctuations. The findings indicated that the choice of fleet composition depends substantially on the annual usage of fleet vehicles and changes in fuel prices. The results also demonstrated that the RH approach could provide more cost-efficient fleet replacement decisions than other currently utilized models.
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