Hala däck vid virkestransporter

Staffan Möller

For many years now, road authorities and representatives from the tyre industry have been well aware of the problems associated with tyre grip loss. The loss of grip is described as the tyres had developed some kind of film or coating. Representatives from the tyre industry believe that a likely explanation is that the coating on the tyre is formed from an asphalt residue found in the water on a wet road surface. The residue is made up of road surface particles worn away by, among others, studded tyres. Chemical analysis, carried out in the 1980s, showed that the coating consists of asphalt, various forms of petroleum products, exhaust residue and salt. The problem occurs only in connection with salted roads. The project has covered the following points:

  • Analysis of a survey, sent out to circa 200 hauliers who work in the timber transport industry
  • A more recent chemical analysis of the coating deposited on tyres with grip loss
  • Collection and compilation of data contained in journals of drivers who work with timber transport in Northern Sweden

Drivers recorded among other things weather, road conditions, traction, and tyre feel. The journal data was supplemented by details of any maintenance measures taken by road managers. The data has been analysed in order to find a trigger pattern for the loss of tyre grip.



Cost Benefit Analysis (CBA) workshop in Stockholm

An open seminar and workshop in Stockholm will be held on 25-26 April 2018. The workshop deals with the use of CBA as a basis for decision-making in the public sector. The workshop is organized by, among others, Professor Jan-Eric Nilsson, VTI.

The 6st Humanist Conference

The 6th HUMANIST Conference will take place 13-14 June 2018 in the Hague, The Netherlands. The scope of the conference covers a wide range of topics on Human Factors in Transport. Tania Willstrand and Alexander Eriksson will present their research results.



VTI will develop simulators for ambulance staff

VTI has initiated a pilot study for paramedics with the Centre for Teaching & Research in Disaster Medicine and Traumatology and Linköping University. The aim is to give ambulance staff the opportunity to practice critical medical tasks in a moving vehicle in...


Unique electrified road opens in Sweden

The world’s first electrified road recharging the batteries of cars and trucks while driving opened in Sweden. The Swedish Minister for Infrastructure, Tomas Eneroth, was at the formal inauguration of the electrified road on April 11, 2018. VTI is one of 22...


Swedish road safety spreads internationally

Sweden is a leading country in terms of road safety, and the research conducted by the Swedish National Road and Transport Research Institute (VTI) has contributed to increased safety. VTI’s remit includes disseminating research results and keeping up to date...


A greater understanding of cyclists' behaviour

Cyclists are often accused of not following traffic rules and being hooligans on the road. New research shows that there is no support for this perception. "Our observations reveal no such general anarchy" says Sonja Forward, researcher at VTI.


New technology for road surface measurement tested

VTI has tested a new scanning-laser technology for road surface measurement. The tests show the new technology for comprehensive transverse-profile measurement provides dependable values in measuring transverse profile and rut depth.


Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018

VTI’s Senior Research Leader Ulf Sandberg has been presented with the TTI Lifetime Achievement Award 2018 for his work on research into tyres and road surface.