The prediction of in-service skid resistance by measurement of the polish resistance properties of aggregate and asphalt in the laboratory is a key tool for specifying and maintaining a safe highway network. Research has been carried out to investigate a laboratory tool designed for that purpose. The Wehner-Schulze machine has been in development since the 1960s and its use is becoming more widespread in Europe. Its ability to characterise the materials available to highway engineers in the UK is the subject of the research reported here.

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