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Jämförelse av vinter och sommardäck på barmark sommartid: tester, riskanalys och djupstudier
Swedish National Road and Transport Research Institute, Traffic and road users, Vehicle technology and simulation.ORCID iD: 0000-0002-8242-3407
Swedish National Road and Transport Research Institute, Traffic and road users, Vehicle technology and simulation.
Swedish National Road and Transport Research Institute, Infrastructure, Crash safety.
Folksam.
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2015 (Swedish)Report (Other academic)Alternative title
Comparison of winter and summer tyres on bare roads summer time : test, risk analysis and in-depth studies (English)
Abstract [sv]

Allt fler bilister har ersatt sina dubbade vinterdäck med dubbfria. Eftersom det inte är olagligt att köra med odubbade vinterdäck på sommaren väljer ett stort antal förare att låta vinterdäcken sitta på även sommartid. Syftet med denna studie har varit att undersöka skillnad i väggrepp mellan vinter- och sommardäck sommartid, samt att uppskatta tänkbara trafiksäkerhetseffekter av att använda vinterdäck sommartid. En fältstudie genomfördes där väggrepp mättes på torr och våt asfalt med olika typer av däck. Resultaten visade att vinterdäcken (odubbade av Nordisk typ) i genomsnitt resulterade i 15–20 procent längre bromssträckor jämfört med sommardäcken. Skaderiskanalyser genomfördes för tre olika typer av trafikolyckor: bakifrånkollision, frontalkollision och påkörning av fotgängare. Studien visade på ökningar av skaderisken vid användning av vinterdäck istället för sommardäck för alla tre olyckstyperna. Vid låga kollisionshastigheter är den absoluta riskökningen liten kanske bara ett fåtal procent, medan den relativa ökningen kan vara stor, ibland upp till en fördubbling av risken. Djupstudier av dödsolyckor sommartid indikerade en riskökning på 3 procent vid användning av vinterdäck sommartid jämfört med sommardäck. Detta resultat är dock inte statistiskt signifikant.

Abstract [en]

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.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2015. , 48 p.
Series
VTI rapport, ISSN 0347-6030 ; 849
Keyword [en]
Tyre, Braking distance, Performance, Wet road, Field (test), Accident, Risk, Fatality, Summer, Winter
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle; 80 Road: Traffic safety and accidents, 81 Road: Accidents
Identifiers
URN: urn:nbn:se:vti:diva-7816OAI: oai:DiVA.org:vti-7816DiVA: diva2:799982
Available from: 2015-04-01 Created: 2015-04-01 Last updated: 2016-02-25Bibliographically approved

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