EVALUATION OF INDUCTION LOOP INSTALLATION PROCEDURES IN FLEXIBLE PAVEMENTS - FINAL REPORT

The problems associated with induction loop failures is addressed through the use of a detailed telephone and literature survey. All Washington state DOT districts, and most of the countries and larger cities are covered along with a random sampling of the major geographic areas of the US. The rates of failures were somewhat similar throughout the state as well as the country. The major problems associated with loop installation failures were closely related to pavement failures and installation deficiencies. The electronics problems centered around periodic adjustment or alignment procedures which are associated with the type of amplifiers used and with the long term integrity of the loop and lead in wire system. This can be improved by using selfaligning amplifiers and by using improved installation techniques.

  • Record URL:
  • Corporate Authors:

    University of Washington, Seattle

    Department of Civil and Environmental Engineering, P.O. Box 352700
    Seattle, WA  United States  98195-2700

    Washington State Department of Transportation

    Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
    Olympia, WA  United States  98504-7300

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Christensen, D
    • Newcomb, D
  • Publication Date: 1985-2

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 74 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00453755
  • Record Type: Publication
  • Report/Paper Numbers: WA-RD 76.1
  • Contract Numbers: Y-2811, Task 18
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Jul 31 1986 12:00AM