This report documents: 1) the state-of-the-practice in retaining and using archived Intelligent Transportation System (ITS) data, and 2) lessons learned from case study analyses of archived ITS data from the Texas Department of Transportation's (TxDOT's) TransGuide (registered trademark) center in San Antonio. The case study analyses of TransGuide (registered trademark) data were focused on data aggregation and data quality (i.e., data errors, missing data, and data accuracy). The state-of-the-practice findings indicate that many operations centers are becoming more interested in archiving ITS data. Several concerns have been expressed by potential users about ITS data quality and location referencing of ITS detector locations. Analyses of TransGuide (registered trademark) data resulted in statistical procedures that can be used to help guide decisions about appropriate data aggregation levels. The researchers also present innovative data archiving approaches that can help to address different data aggregation needs, including capabilities such as data sampling, on-demand archiving, and data broadcasts. In other analyses, the researchers found mixed results in comparing traffic volumes from TransGuide (registered trademark) detectors to other nearby TxDOT traffic counting stations and ground truth video. At one location, traffic volumes from both detectors were within 5% of ground truth, whereas detectors at the second location ranged between 12 to 38% less than ground truth. In analyses of a full month of data, the researchers also found that the level of missing data was nearly 20%, whereas basic quality control checks flagged only 1% of the data as suspect or erroneous.

  • Record URL:
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  United States  76011

    Federal Highway Administration

    ITS Joint Program Office
    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Turner, S M
    • Eisele, W L
    • Gajewski, B J
    • Albert, L P
    • Benz, R J
  • Publication Date: 1999-8


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 140 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00798939
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-PL-99-024,, Final Report
  • Files: NTL, TRIS, USDOT
  • Created Date: Sep 15 2000 12:00AM