Successful Practices in Weigh-in-Motion Data Quality Assurance

Arizona's Department of Transportation (ADOT's) ability to capture and record the axle weights and gross vehicle weights of commercial vehicles as they travel on roadways, known as weigh-in-motion (WIM), will soon be enhanced by the purchase and installation of equipment that will create approximately 23 WIM stations over the next year, with the hope of eventually installing up to 60. The stations will comprise piezoelectric quartz sensors of two types: The majority will be Measurement Specialties, Inc. "Brass Linguini," which ADOT chose because of their moderate cost and familiarity to staff, and a much smaller number will be a model made by Kistler. The deployment of these stations will allow ADOT to better determine the weight tolerances to which pavement should be designed, to pursue targeted enforcement of weight violations, to enhance its analysis of freight traffic through travel demand modeling, and to expand the ability to collect other traffic data, such as vehicle classification and speed. ADOT's WIM stations will be installed in areas of significant temperature variation and on rural highways with low traffic volumes. However, an informal poll by ADOT of WIM staff from neighboring states suggests that piezoelectric sensors can be inaccurate at low temperatures, are untested at sustained high temperatures, and can be self-calibrated through WIM hardware only at high-traffic volumes. As a result, adding the piezoelectric WIM stations to the department's traffic data collection network will require obtaining clear recommendations for the best calibration methods, skilled maintenance, and quality assurance of large amounts of data. At least two new staff members will be needed to manage and analyze the data that will be collected, including scrubbing it after it is collected and calibrating it against certain known-weight objects, such as the front axles of certain classes of trucks.


    • English


    • Status: Completed
    • Contract Numbers:


    • Sponsor Organizations:

      Federal Highway Administration

      1200 New Jersey Avenue, SE
      Washington, DC  United States  20590

      Arizona Department of Transportation

      206 South 17th Avenue
      Phoenix, AZ  United States  85007
    • Project Managers:

      DiBugnara, Frank

    • Performing Organizations:

      Applied Research Associates, Incorporated

      7184 Troy Hill Drive, Suite N
      Elkridge, Maryland  United States  21075
    • Principal Investigators:

      Selezneva, Olga

    • Start Date: 20140212
    • Expected Completion Date: 0
    • Actual Completion Date: 20151130
    • Source Data: RiP Project 39788

    Subject/Index Terms

    Filing Info

    • Accession Number: 01566184
    • Record Type: Research project
    • Source Agency: Arizona Department of Transportation
    • Contract Numbers: 731
    • Files: RiP, STATEDOT
    • Created Date: Jun 12 2015 1:00AM