The large-scale project, the Winter Model, will produce a model for assessing the most
important effects of changes in winter maintenance strategies and operations, and their
monetary value. The winter road condition model is the central part of the Winter Model.
The road condition model will characterize the state of a winter in terms of a road condition
description hour by hour. The road condition model provides input data for the other
models where different effects such as accident risk, travel time, fuel consumption and
environmental effects are assessed. In the first stage we intend to develop a model that
describes how road conditions are affected by weather, maintenance measures taken and
traffic on two lane rural roads with a width of 7-9 m and speed limit of 90 km/h. To a great
extent, the basis for developing the winter road condition model will be data already
collected from nine observation sites with the purpose of developing the accessibility
model. For several periods, data from these observation sites contain information hour by
hour regarding weather, traffic flow, initial road condition, maintenance measures taken
and specified types of road condition development mainly connected with snow ploughing
and anti-icing measures. Additional information, mostly development of ruts down to the
pavement in hard-packed snow or thick ice caused by vehicles with studded tyres, and the
mechanism for a wet or moist road to dry out, will be collected by field studies as from the
winter season 2002/2003.
VTI., VTI notat 19A-2006 , 2006. 19-24 p.