The article examines the problem of road traffic damage and suggests that all the factors that cause damage should be examined and not simply static axle load. Although it has been shown that road damage is proportional to the fourth power of static axle weight this should not be interpreted as gross vehicle weight. Damage to a road surface must be a function of dynamic axle loading which in turn is a function of axle load and suspension characteristics. Tyre/road impact loads can be studied in two parts - the initial impact and the subsequent decaying impacts due to vibration. Graphs are given which show the effect of the vertical load on a road surface of changing suspension parameters such as tyre stiffness, unsprung mass and interleaf friction. Also considered are the effects of load distribution and dynamic load transfer due to braking. Developments in suspension design for heavy vehicles are likely to be towards systems giving low dynamic load changes on the road surface resulting in reduced damage. /TRRL/

  • Availability:
  • Corporate Authors:

    Institution of Mechanical Engineers

    1 Birdcage Walk
    London SW1H 9JJ,   England 
  • Authors:
    • Cady, J B
    • Aston, RAH
  • Publication Date: 1975-12

Media Info

  • Features: Figures;
  • Pagination: p. 57-60
  • Serial:
    • Volume: 1
    • Issue Number: 1
    • Publisher: Institution of Mechanical Engineers
    • ISSN: 0307-6490

Subject/Index Terms

Filing Info

  • Accession Number: 00137709
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 13 1977 12:00AM