Detailed evaluation of specific road links or sections.

Predicts defects like cracking, rutting, potholes, and roughness (IRI) based on traffic loading, climate, and structural strength.

Focuses on the prioritization of a defined list of candidate road projects into a multi-year rolling work program.

Analyzes entire road networks or sub-networks (e.g., all national highways) over the medium to long term.

HDM-4 is divided into three dedicated application tools tailored to different levels of road administration decision-making:

Optimizes the use of constrained budgets by selecting the best combination of works to maximize economic benefits (often using the incremental NPV/cost ratio). Project Analysis

The software is built on the concept of , typically spanning 15 to 40 years. It models the complex interaction between: