Tema Vintermodell: olycksrisker och konsekvenser för olika olyckstyper på is- och snöväglag

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The aim of this study is to augment the Accident Risk Model (within the Winter Model) with accident risk and the consequences of different types of accident, in order that the costs of accidents in icy and snowy road conditions may be calculated. We have calculated the accident risk by dividing the nutuber of accidents by vehicle mileage for the winters of 1993/1994 through 1996/1997. In this study, we have grouped accidents into four types: single-vehicle accidents, head-on collisions, rear-end collisions and other accidents. For all accident types the accident risk is higher on icy and snowy roads than on dry bare roads. Head-on collisions and single-vehicle accidents have the highest relative accident rates, with accident risks that are more than ten times higher in snowy and icy road conditions. For single-vehicle accidents, it is the thin ice/hoar frost that is the main cause of this great increase. Generally, the consequences of head-on collisions are more serious on roads with snow and ice than on dry bare roads in the wintertime, while for single-vehicle accidents the consequences are less serious. We have calculated the consequences by dividing the nutuber killed, severely injured and slightly injured by the total number of accidents. For these calculations, accident data for all winters during the whole of the 1990s have been used.

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