TYRES AND SKIDDING ON WET ROADS

DAECK OCH VAATGLIDNING

Slipping occurs when friction between tyre and carriageway decreases. Water usually contributes to this; if there is too much water for the tyre pattern to disperse, aquaplaning may occur. For good road holding, water on the carriageway must be removed from under the tyre. The greater the speed, the less time there is for this; the lower the specific pressure, the harder it is for the tyre to break through the water. The better the tread sits on the carriageway, the more uniform the ground pressure; the wider the tread, the greater the contact area and the less the specific wear. The higher the inflation pressure, the greater the specific ground pressure and the more stable the tyre, especially in bends; wear is however worse and so is springing, which might cause bounce. If inflation pressure is lowered, contact area is greater but more heat is generated. Springing is better but stability is reduced. Tread pattern is a compromise between transverse ribs to reduce slipping, and longitudinal ribs for steering properties and resistance to lateral forces. The grooves must be the widest possible to facilitate water removal. The casing must resist all forces encountered. Car and tyre design must be coordinated. /TRRL/

• Corporate Authors:

  Motorbranschen Foerlag

  Karlavaegen 14A, P.O. Box 5611
  S11486 Stockholm,   Sweden 
• Publication Date: 1977-2

Language

• Swedish

Media Info

• Features: Photos;
• Pagination: p. 68-70
• Serial:
  • Motorbranschen
  • Issue Number: 2
  • Publisher: Motorbranschen Foerlag

Subject/Index Terms

• TRT Terms: Aquaplanes; Durability; Friction; Hydroplaning; Pavement grooving; Pavements; Pressure; Rolling contact; Skid resistance; Skidding; Surface course (Pavements); Texture; Tire treads; Tires; Traffic lanes; Vehicles; Wet weather
• Uncontrolled Terms: Contact area; Wet pavements
• Old TRIS Terms: Grooves
• ITRD Terms: 1057: Air transport network; 3012: Aquaplaning; 2992: Carriageway; 5440: Contact (tyre road); 5412: Pressure; 3031: Skid resistance; 1645: Skidding; 3053: Surface texture; 1381: Tyre; 1392: Tyre tread; 3015: Wet road
• Subject Areas: Highways; Pavements; Safety and Human Factors; Vehicles and Equipment; I23: Properties of Road Surfaces; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 00163975
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Dec 27 1977 12:00AM