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1.5 Overview The most important recommendations can be summarised as follows: Costs of scarce infrastructure (congestion for road, scarcity for other modes), selected parts of accident costs, and environmental costs are treated as the external costs of transport according to the welfare-theory approach. The level of externality differs according to cost categories and transport modes. Environmental costs are considered as fully external. The values should be based on marginal cost estimation for specific traffic situations and clusters. If an aggregation of figures is difficult and cost functions are complex, top-down approaches based on national values may be used in addition. The valuation methodology should follow the impact pathway approach using willingness to pay or willingness to accept approaches. If the dose-response functions are complex or uncertain, other approaches such as the estimation of avoidance costs can be appropriate (e.g. for climate costs). The differences between transport modes are specifically relevant for congestion/scarcity costs and the consideration of the production of electricity for the railways. The unit values should be presented considering the main cost drivers. Costs per traffic unit are a common basis. For some externalities however, other cost drivers have to be considered, too. Table 5 shows the main issues and cost drivers per cost component. The following chapters present the details per cost category.
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