In an effort to estimate the damage associated with the heavier vehicles using today's highways, considerable work has been directed toward evaluation of load equivalency factors for different axle loads and axle configurations. Various methods of evaluating equivalency factors were reviewed. The AASHTO load equivalency factors were based on empirical performance data obtained at the AASHO Road Test. For the most part, other methods have been based either on pavement response (maximum surface deflection, maximum tensile strain, etc.) or pavement distress (rutting, fatigue cracking, etc.). The AASHTO equivalency factors were calculated for single and tandem axle configurations only. Accordingly, extrapolation has been required to evaluate newer axle configurations. The results of a survey (telephone, written correspondence, and research report review) indicate that the 18 kip (80 kN) single axle equivalency factors developed at the AASHO Road Test are still in wide use both in the United States and abroad. /FHWA/

  • Supplemental Notes:
    • This study was conducted in cooperation with the U.S. Department of Transportation, Federal Highway Administration. Project Title: A Study of Flexible Pavement Base Courses and Overlay Designs: Second Cycle of Research at the Pennsylvania Transportation Research Facility.
  • Corporate Authors:

    Pennsylvania State University, University Park

    Pennsylvania Transportation Institute, Transportation Research Building
    University Park, PA  United States  16802
  • Authors:
    • Anani, B A
    • WANG, M C
  • Publication Date: 1978-3

Media Info

  • Pagination: 26 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00194752
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-PA-RD-75-2-6 Intrm Rpt., FCP 35C3-252
  • Contract Numbers: PennDOT Res Proj 752
  • Files: TRIS, USDOT
  • Created Date: Aug 15 1979 12:00AM