Development of Statewide WIM Data Quality Control and Axle Load Spectra and Traffic Volume Adjustment Factors for Oklahoma

Traffic loads are one of the key data elements required for the design and analysis of pavement structures. Traditionally the mixed traffic stream was aggregated into equivalent single-axle loads (ESALs). The Mechanistic Empirical Pavement Design Guide (MEPDG), later named as DARWin-ME and Pavement ME Design, proposes a more rational approach to characterize traffic in terms of full axle-load spectrum. It provides users with the flexibility to input three levels of traffic inputs based on data availability and the importance of the project: Level 1 site specific with the highest quality, Level 2 regional specific with medium quality, and Level 3 state or national defaults with the lowest quality. To meet the traffic data requirements in DARWin-ME, automated traffic collection techniques are needed. However, automated traffic data often have errors, particularly for data collected from weigh-in-motion (WIM) sites. One of the primary causes is that many state agencies are lacking in staffing, resources, and relevant supporting software to examine the huge amount of raw WIM data for quality assurance (QA), while most WIM sensor vendors do not include details for quality control (QC) in reports. It is impractical to manually process the data files even with computer assistance, and this process needs to be automated with software for routine implementation. This project will develop quality control (QC) metrics and associated software interfaces for checking the quality of statewide WIM data. It will also develop site-specific, region-specific, and statewide traffic inputs that are required for the Mechanistic-Empirical (ME) based pavement design in Oklahoma.

  • Supplemental Notes:
    • Contract to a Performing Organization has not yet been awarded.


  • English


  • Status: Proposed
  • Sponsor Organizations:

    Oklahoma Department of Transportation

    200 NE 21st Street
    Oklahoma City, OK  United States  73105

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Start Date: 20160101
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01590809
  • Record Type: Research project
  • Source Agency: University of Oklahoma, Norman
  • Files: UTC, RiP
  • Created Date: Feb 22 2016 1:03PM