VEHICLE WEIGHT REGULATION AND THE EFFECTS OF INCREASED LOADING ON PAVEMENTS

HEAVILY LOADED VEHICLES ARE PARTICULARLY DAMAGING TO HIGHWAY PAVEMENTS AND PROTECTIVE WEIGHT LIMITATIONS SAFEGUARD THE HIGHWAY INVESTMENT. OVER THE PAST FOUR DECADES, THE CHANGING NEEDS OF TRANSPORTATION HAVE REQUIRED UPWARD REVISIONS IN THESE WEIGHT LIMITATIONS, AND FURTHER UPWARD REVISION IS AGAIN UNDER CONSIDERATION. THE REACTION TO LOADING OF FLEXIBLE AND RIGID PAVEMENTS, THE EFFECTS OF DIFFERENT WHEEL LOADS ON PAVEMENT LIFE, THEIR EQUIVALENCE IN TERMS OF PAVEMENT DAMAGE, AND THE INFLUENCE OF ADJACENT AXLES, ARE DESCRIBED. INCREASED MAINTENANCE AND STRENGTHENING OVERLAYS ARE NEEDED FOR INCREASED WHEEL LOADS. A 1967 VEHICLE SURVEY SHOWED THE 85 PERCENTAILE SINGLE-AXLE LOAD TO BE ABOUT 22 KIPS, SO THAT RAISING THE WEIGHT LIMITATION FROM 18 KIPS TO 20 KIPS WOULD ONLY RESULT IN REGULARIZATION OF THOSE TRUCKS WITH 20 KIP SINGLE-AXLES NOW REGARDED AS OVERLOADED. STRICTER ENFORCEMENT MUST ENSURE THAT THERE IS NO UPWARD SHIFT IN THE LOADING SPECTURM WHEN THE WEIGHT LIMITATIONS ARE RAISED. SOME ASPECTS OF ECONOMIC LIMITATIONS ARE PRESENTED AND A LICENSE FEE STRUCTURE BASED ON LOAD EQUIVALENCY FACTORS IS SUGGESTED. /HSRI/

  • Supplemental Notes:
    • Rept No Rr151, 16 PP, TABS
  • Corporate Authors:

    Ontario Department of Highways

    1201 Wilson Avenue
    Toronto, Ontario M3M 1J8,   Canada 
  • Authors:
    • Phang, W A
  • Publication Date: 1969-11

Subject/Index Terms

Filing Info

  • Accession Number: 00205861
  • Record Type: Publication
  • Source Agency: Highway Safety Research Institute
  • Files: TRIS
  • Created Date: Apr 18 1971 12:00AM