Trafikverkets beräkningsmodell för ersättning av vinterväghållningsåtgärder, version VädErs-Kombination, Underlag Väderindex och VädErs 2016: beskrivning med exempel och kommentarer

Staffan Möller

The Swedish Transport Administration has decided to further develop the calculation model used to regulate the costs of winter road maintenance measures between clients and contractor. In connection with the development of the new version of the calculation model, VädErs 2016, a new computer program was made. In this report the rules and procedures used in VädErs 2016 are documented. Also the rules and procedures used in the two earlier versions of the calculation model, VädErsKombination and Underlag Väderindex, are documented in the report. A good calculation model, based on this winter's character, for regulating costs for winter road maintenance measures between client and contractor requires two well-functioning sub models. - 1. A sub model describing the weather during the winter season. - 2. A sub model that links the weather descriptions to the needs to take measures, not necessarily in a 1–1 ratio. The report shows in detail how the three versions of the Swedish Transport Administration’s calculation model work from the start, weather raw data, to the final phase, so called weather outcomes, the basis for compensation. The following weather raw data is used in the calculation model: Air temperature, road surface temperature, dew point temperature, type of precipitation, amount of precipitation and wind speed.



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