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.



Open seminar with Mistra SAMS international scientific advisory...

Mistra SAMS international scientific advisory panel (ISAP) is visiting Stockholm, and the program will host an open seminar where the panel members will give talks in their area of expertise.

ERPUG 2017

The five year anniversary of  European Road Profile Users' Group (ERPUG) Forum will take place at Ramboll head quarter, Copenhagen, Denmark October 19-20, 2017. 



Vehicle Driver Monitoring: sleepiness and cognitive load

To prevent road crashes it is important to understand driver related contributing factors, which have been suggested to be the critical reason in 94 per cent of crashes. The overall aim of the project Vehicle Driver Monitoring has been to advance the...


Tomas Svensson new director-general

Tomas Svensson was today appointed Director-General of VTI. Tomas has been acting Director-General since January 2017. 


Crash testing bicycles at VTI

For the first time single bicycle crashes have been simulated at the VTI crash safety laboratory.


A case study exploring firefighters’ and municipal officials’ preparedness for electrical vehicles

A VTI-study presents a social perspective on new vehicle technology. It explores the self-reported preparedness of the fire departments (i.e., rescue services) in Sweden’s three largest cities regarding rescue operations involving electrical vehicles (EVs).


Pioneering research on and about bicycles at VTI

Under what circumstances might cyclists lose tyre grip? What actions could then be taken to prevent a crash? VTI is currently developing a theoretical model of the behaviour of bicycle tyres during braking and steering in different situations and on different...


Virtual pedestrians create efficient stations

If more people are to choose sustainable travel, then the public transport stations of the future must be designed so that pedestrians can get where they are going quickly, without congestion or queues. The Swedish Road and Transport Research Institute (VTI)...