This guide is part of the project Accident Costs for Project Planning and Evaluation and provides information on the use of cost data in project evaluation. The aim of the guide is to show how to analyse safety benefits, disbenefits and costs associated with the use of particular safety devices, treatments or activities directed at the road environment, the vehicle environment, or road user behaviour. Worked examples of benefit-cost analysis are given for countermeasures that reduce accident frequency and countermeasures that modify injury severity. They give the changes converted to dollar values, the capital and operating costs, the benefit-cost ratio and the net present value. This method is more reactive to the effects of countermeasures than the previous use of accident severities.
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