STUDDED TYRES. SUMMARY OF THE TESTS CARRIED OUT IN FRANCE FROM 1971 TO 1977. DEVELOPMENT OF THE NEW REGULATIONS

LES PNEUS A CRAMPONS. SYNTHESE DES ESSAIS EFFECTUES EN FRANCE DE 1971 A 1977 MISE AU POINT DE LA NOUVELLE REGLEMENTATION

The article describes investigations on studs and surfacings as well as on the effectiveness of studded tyres. Three hypotheses were made on the principles of the action of the studs: impact, the pressure on the ground, abrasion. In reality there is a combination of these three actions according to the driving conditions or the equipment of the vehicle. The wear caused by studded tyres is influenced by the diameter (and thus the weight) of the stud, the impact speed and the wheel load. As far as bituminous materials are concerned, the wear is conditioned by the degree of compaction, the nature and grading of the aggregate, the nature of the bitumen and the fines content. Formulations can be derived which provide reduced wear. In order to evaluate the effectiveness of studded tyres, tests were carried out on ice at constant temperature. Measurements were made of the limiting speed for the stability of the vehicles in a straight line and in a chicane (overtaking and cutting-in) and, in addition, the reduction of braking distances. The significant parameters included the number of studs per wheel, the protrusion and state of wear of the studs and the number of wheels equipped. The third section is devoted to economic data: cost to the infrastructure occasioned by the use of studded tyres, the cost of accidents on snow covered or icy roads. (TRRL)

  • Authors:
    • Bourigues, J B
    • MARTIN, M
    • Lucas, J
    • REQUIRAND, R
    • Favero, J L
  • Publication Date: 1978-10

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00325700
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1981 12:00AM