Jämförelse av vinter och sommardäck på barmark sommartid: tester, riskanalys och djupstudier

Comparison of winter and summer tyres on bare roads summer time: test, risk analysis and in-depth studies

In Sweden non-studded winter tyres has become increasingly popular during the winter season. Since it is allowed to use non-studded winter tyres also during summer time, a large number of drivers choose to do that. The purpose of this study has been to investigate the difference in road grip between winter- and summer tyres summer time, and to assess possible effects on traffic safety. A field test was carried out where road grip was measured on dry and wet asphalt pavement with different types of tyres. The results showed that the winter tyres (non-studded of Nordic type) led to 15—20 per cent longer braking distances compared to summer tyres. Accident risk analyses were performed for three types of accidents: rear end collision, frontal collision and collision with pedestrian. The study indicated that using winter tyres leads to an increase in accident risk for all three accident types. At low collision speeds the absolute increase in risk is small, maybe just a few percent, but the relative increase may be large, sometimes up to 100 per cent. In-depth studies of fatal accidents indicated a 3 per cent increase of risk from using winter tyres summertime, compared to summer tyres. However, this result was not statistically significant.

• Record URL:
  http://vti.diva-portal.org/smash/get/diva2:799982/FULLTEXT02.pdf
• 
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03476030
• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • Hjort, Mattias
  • Bruzelius, Fredrik
  • Andersson, Håkan
  • Krafft, Maria
  • Ydenius, Anders
  • Rizzi, Matteo
• Publication Date: 2015

Language

• Swedish

Media Info

• Pagination: 48
• Serial:
  • VTI Rapport
  • Issue Number: 849
  • Publisher: Swedish National Road and Transport Research Institute (VTI)
  • ISSN: 0347-6030

Subject/Index Terms

• TRT Terms: Braking performance; Crashes; Durability; Fatalities; Field tests; Hazards; Summer; Surface course (Pavements); Tires; Wet weather; Winter
• Uncontrolled Terms: Wet pavements
• ITRD Terms: 1643: Accident; 1695: Braking distance; 1602: Fatality; 6226: Field (test); 5910: Performance; 9150: Risk; 2534: Summer; 1381: Tyre; 3015: Wet road; 2575: Winter
• Subject Areas: Highways; Safety and Human Factors; I80: Accident Studies; I91: Vehicle Design and Safety;

Filing Info

• Accession Number: 01613221
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, VTI
• Created Date: Oct 17 2016 11:58AM