Krav på belagda väg-, cykel- och gångbanors friktionsegenskaper vid barmarksförhållanden: Underlag och rekommendationer

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The report presents a summary of existing data for current requirements and limit values, historica lfeedback, external monitoring and background facts, as well as recommendations for measurement method, measures and limit values with regard to consequences and feasibility. It can be noted that evidence-based proof is often lacking for current rules and limit values. Tire road friction is a complicated property that is difficult to measure as it depends on so many factors. Therefore, the recommendations will often be to use current methods and limit values. For motorways it is proposed to continue to use the skiddometer principle and SFT (Surface Friction Tester) with specifications according to the previous standard. For road markings it is proposed to use SFT where possible, otherwise PFT (Portable Friction Tester) and for pedestrian and cycle paths it is proposed to use PFT.As a limit value it is recommended to use 0.50 at 70 km / h (as before). From comparative measurements it can be stated that 0.55 at the measuring speed 40 km / h corresponds to 0.50 at 70 km/h. Furthermore, measurements indicate that PFT and SFT measurement data can directly replace each other with certain reservations. In order to control the grip even better, it is reasonable to place demands on the macro texture, as a complement to the friction measurement at higher permissible speeds, for example above 70 km/h.

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