Abstract
AbstractTemperature recordings from the Swedish Road Weather Information System (VVIS) were analysed with respect to variations in the risk of road slipperiness during synoptic situations resulting in a rapid warming. Climatological data from 24 VVIS stations in the county of Södermanland, Sweden, were used in this study.During warm‐air advections, variations in the warming of the air and the road surface can lead to the development of slipperiness through sublimation. Important factors contributing to a varying spatial pattern in the risk of slipperiness are found to be: type of weather preceding a warm‐front movement, local topography, and thermal properties of the road‐bed material. The weather situation preceding a warm‐front and the local topography influence the variation in warming rate between the stations. A rapid warming and an early risk of road slipperiness were found at open valley locations. At stations surrounded by dense vegetation, the warming of the air and road surface were more prolonged and the risk of slipperiness occurred several hours later than at open sites. The road construction materials were found to influence the warming rate of the road surface, which has an effect on the variation in the risk of slipperiness during situations preceded by cloudy, windy weather.
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