An impact hierarchy for the evaluation of intervention strategies for public roads
Résumé
In this paper a hierarchy of impacts is presented that can be used to evaluate intervention strategies for public roads. The hierarchy has been developed to help reduce confusion at the onset of the determination of optimal intervention strategies, with respect to the stakeholders to be considered and the evaluation of how they are affected. It is developed using a multiple stakeholder approach, where it is considered that all people at a specific point in time can be classified into one of the four principle stakeholder groups: the owner, the users, the directly affected stakeholders, and the indirectly affected stakeholders. To help to ensure orthogonality in the impact hierarchy, each impact type, on the lowest defined level, is explained and classified as contributing to one of the pillars of sustainability (economic, societal, environmental). In order to demonstrate how the impact hierarchy could be used, the optimal intervention strategy for a fictive road link is determined.