Abstract
Abstract We have described evidence showing that wet friction of rubber on hard surfaces is affected by two components in the hard surface—one deformation, the other abrasion. In this report we relate this to the properties of road surfaces and show that with appropriate simple measurements it is possible to estimate the relative importance of these two contributions in roads. SLIPPERINESS OF ROADS Data on slipperiness of roads taken under controlled conditions with a standard reference are rather limited, the most extensive material available applying. to European roads. We have therefore made a survey, which is continuing, in which we measure the properties of roads in use. Results reported here give us considerable confidence that roads are so similar in character that our sample is representative and that quantitative analysis of their surface characteristics can be made. It is well established that roads become slippery by polishing in use; the methods described here make it possible to estimate that extent of polishing in a quantitative way.
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