There is a concern that trucks may be avoiding weigh stations by choosing alternate routes (called bypass routes), thus preventing detection of overweight conditions or other violations. The first study, conducted in September and October of 1990, was centered around the Simpson County enforcement station on Interstate 65 near the Kentucky-Tennessee border. Data were collected using weigh-in-motion (WIM) and automatic vehicle classification (AVC) equipment, which was installed on Interstate 65 and on three potential bypass routes. This study did not produce any strong evidence for the existence of significant bypassing activity. The second study, conducted in October of 1991, was centered around the Kenton County weigh station on southbound Interstate 75 in northern Kentucky. The analysis of these data also yielded no significant conclusions. Finally, the file of statewide WIM data, collected and maintained by the Division of Planning of the Kentucky Department of Highways, was analyzed to determine average truck weights and overweight percentages at various sites throughout the state. This analysis also did not result in any significant findings. Conclusions drawn from these studies are as follows: (1) While it is generally accepted that weigh station bypassing does occur in Kentucky, there was no indication of significant numbers of trucks modifying their route choices based on enforcement activity on the selected bypass routes; (2) Average truck weights and percent of trucks overweight are higher on bypass routes than on Interstate routes, but this is not primarily a result of bypassing activity; (3) The majority of trucks on bypass routes have legitimate reasons for being on those routes; (4) A high percentage of trucks on bypass routes have violations; (5) The most common inspection violations on bypass routes are safety-related equipment violations, with driver violations being the next most common; (6) Temporary enforcement efforts on bypass routes may be extremely effective in identifying violations and issuing citations, and can be self-supporting through the revenue generated from citations; and (7) Due to accuracy considerations and data "scatter", high-speed WIM data may not be appropriate for certain uses.

  • Record URL:
  • Corporate Authors:

    University of Kentucky, Lexington

    Kentucky Transportation Center
    College of Engineering, 176 Raymond Building
    Lexington, KY  United States  40506-0281

    Kentucky Transportation Cabinet

    200 Mero Street
    Frankfort, KY  United States  40622

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Southgate, H F
    • Crabtree, J D
    • Pigman, J G
    • Stamatiadis, N
  • Publication Date: 1993-5


  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 55 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00664336
  • Record Type: Publication
  • Report/Paper Numbers: KTC-93-13
  • Created Date: Aug 17 1994 12:00AM