The aim of the project described in this report has been to develop a method for a) estimating the number of accidents which can be expected to occur in the course of transporting dangerous substances by road and railroad, b) estimating the probabilities of a number of possible event sequences/scenarios which may occur as the result of an accident and providing estimates of the expected consequences of each scenario, and c) calculating the expected costs of accidents due to the transportation of dangerous substances by road and railroad.