In Japan, during winter, we have considerable snow in the district along the Sea of Japan. Expressways passing through the snowy region (the average maximum depth of snow in 10 years is more than 30 cm) is equivalent to about 50 per cent of the whole network. During the winter, various traffic problems occur, such as traffic accidents, and road closures due to low-visibility by blizzard or snowfall. As most of expressways passing through the snowy area, these problems will be getting serious. Nowadays, expressways are indispensable for our daily life. Therefore the solution of these traffic problems during the winter becomes urgently. In order to solve these problems in the winter and aim for improving the service level for users, we are implementing researches and developing utilization of ITS. The technical innovation of ITS is remarkable these days. In this paper, some of the examples of ITS researches and development we have carried out are introduced.