Sopsaltningens effekt på cykeltrafiken: en analys av cykelflöden och olyckor i Stockholm

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A winter maintenance method for cycleways becoming widespread in Sweden is “sweep-salting”. The method entails a front-mounted power broom for snow clearance and brine, pre-wetted or dry salt for de-icing. Traditionally in Sweden, ploughing and gritting is used for winter maintenance of cycleways and footways. At VTI the sweep-salting method has been evaluated in several research studies, focusing on the method, equipment and strategies in order to give recommendations regarding the implementation of the method. In the study presented in this report, this research has been complemented with analysis of accident data from Strada, from 2013 through 2017 and the winter seasons 2012/13–2017/18, including cyclists, pedestrians and moped riders as well as cycle flow measurements from Stockholm, with the objective to evaluate the effects of sweep-salting on cyclists.

All in all, our analyses of bicycle flow measurements from Stockholm show that sweep-salting contributed to increase the winter cycling. The analyses of accident data indicate that sweep-salting has also contributed to reduce the number of accidents due to skidding. Since the sweep-salted cycle routes are generally important for commuting resulting in relatively high cycle flows, it is likely that the accident risk per cyclist is lower after sweep-salting has been introduced. However, the available data was not extensive enough to quantify the effects. Nevertheless, it is clear that sweep-salting has not led to an increased accident risk. Fall accidents among pedestrians represent the major part of the accidents due to skidding and they occurred mainly on sidewalks in the inner city. We have also analysed weather data from VViS stations located along the road network around Stockholm and from one of SMHI's weather stations in Stockholm.

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