TRL have carried out surface friction measurements on two sections of the A12 Chelmsford bypass, and a section of the A14 between Whitehouse and Copdock. Each section had been treated with a longitudinal diamond grinding technique used to restore surface texture and skid resistance. Low speed skid resistance measurements were made on each of these sites up to 36 months after the grinding treatment was applied. Measurements of locked wheel friction were made over a range of speeds on treated and un-treated surfaces, at several intervals after grinding. This report presents the results of the measurements to date and discusses their implications for the widespread adoption of this technique across the Highways Agency network.

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