Winter maintenance (WM) is a complex and expensive service which represents a greater amount of roads maintenance costs in every country with relatively severe winters. In Slovenia, current estimates show that about 60 per cent of maintenance costs are due to winter maintenance. The central question is therefore: How to make the winter maintenance service more cost effective? There are two important basic issues which we may expect to contribute towards a more effective WM service. First, the organizational scheme of WM, and second, the extent of knowledge of actual winter conditions in (climatic) subparts of the country. Both issues are considered here. A concessionary system for both regular and winter maintenance was already proposed earlier. Here a new organisational scheme for roads maintenance is presented in connection to the accompanying data, in particular weather data for WM. Important weather (climatic) variables are briefly described, and a possible consideration of risk estimation for the case of seasonal snowfall is presented. As far as socio-economic costs are concerned the analysis is simplified and limited to the Vth and the Xth TEN corridors. A detailed consideration is given for a few so-called critical points along the corridors. A possible method for congestion times and costs estimates for an extreme winter weather event at a critical point is described, and proposals for these extra costs sharing are given. Also, a possibility of weather related accidents at critical points is briefly mentioned.