The VAHA research program focused on managing the social impacts of road management. They aimed to improve impact assessment methods and data use, closing information gaps and enhancing the Road Administration's data reserves. VAHA developed methodologies for impact assessment, including an effectiveness assessment method and guidelines for road investments. Lessons learned include the importance of using impact information in decision-making, the need for readily available impact data, and the necessity of understanding impacts at both micro and macro levels. The impact map standardizes the conception of road management impacts, and specialized skills are required for evaluating impacts effectively.