Sizing Finite-Population Vehicle Pools

A vehicle pool is a number of vehicles at a single location used for the same purpose. The authors focus on the problem of sizing vehicle pools for a finite set of subscribers who can use the pool. The goal is to minimize the number of vehicles in the pool while still meeting nearly all subscriber requests. Formally, the authors propose three analytical techniques to size a vehicle pool for a finite population of subscribers, according to the pools' busy period demand to guarantee all requests are served with probability 1 - ε, i.e., a quality-of-service (QOS) guarantee. Moreover, an additional heuristic sizing method is proposed which requires no prior data about pool demand. Although this method does not provide probabilistic bounds on QOS, it is shown in practice that it still achieves a high QOS. The authors evaluate the sizing methodologies using seven years of data from a local car share, using three performance metrics: availability (percentage of requests served), utilization (the percentage of time that vehicles in the pool are used) and member-to-vehicle ratio (the size of the pool relative to the size of its user population). It is shown that our methods perform well with respect to these metrics.


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  • Accession Number: 01539286
  • Record Type: Publication
  • Files: TLIB, TRIS
  • Created Date: Sep 9 2014 3:27PM