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Practical Approximations to Quantify the Impact of Time Windows and Delivery Sizes on Freight VMT in Urban Areas

Principal Investigator:

Miguel Andres Figliozzi, Portland State University


Summary:

This paper studies approximations to the average length of Vehicle Routing Problems (VRP). The approximations are valuable for strategic and planning analysis of transportation and logistics problems. The research focus is on VRP with varying number of customers, demands, and locations. This modeling environment can be used in transport and logistics models that deal with a distribution center ser... This paper studies approximations to the average length of Vehicle Routing Problems (VRP). The approximations are valuable for strategic and planning analysis of transportation and logistics problems. The research focus is on VRP with varying number of customers, demands, and locations. This modeling environment can be used in transport and logistics models that deal with a distribution center serving an area with daily variations in the demand. The routes are calculated daily based on what freight is available. New approximations and experimental settings are introduced. Average distance travelled is estimated as a function of the number of customers served and the number of routes needed. Approximations are tested in instances with different customer spatial distributions, demand levels, number of customers, and time windows, Regression results indicate that the proposed approximations can reasonably predict the average length of VRP problems in randomly generated problems and real urban networks. See More

Project Details

Project Type: Research
Project Status: Completed
End Date: August 31, 2009
UTC Funding: $25,933

Downloadable Products

  • OTREC-RR-09-07 Practical Approximations to Quantify the Impact of Time Windows and Delivery Sizes on VMT Multi-stop Tours (FINAL_REPORT)
  • Practical Approximations project brief (PROJECT_BRIEF)

 

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