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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.

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