Gaëlle Le Bars discusses using the Highway Development and Management model (HDM-4) as a decision making tool for road asset management. HDM-4 allows analysis of pavement behavior over the lifecycle, calculates economic indicators, and defines maintenance strategies and budgets. It helps answer questions about road network conditions, priorities, solutions, and efficient use of funds. HDM-4 predicts performance based on traffic, roads, maintenance, climate, and quantifies user benefits. It is a strong, quantitative model that supports optimal investment levels and strategies for road networks.