Hdm-4 Software Jun 2026

| Data Layer | Key Inputs | Typical Source | | :--- | :--- | :--- | | | Road ID, length, width, surface type, traffic direction | PMS database, GIS | | Pavement Condition | Initial IRI, cracking %, rut depth (mm) | Laser profilometer, manual surveys | | Traffic | AADT, vehicle class distribution (car, bus, 2-axle truck, articulated truck), annual growth rate, ESA/vehicle | Weigh-in-motion (WIM), traffic counts | | Climate | Mean annual rainfall, temperature, Thornthwaite moisture index | Weather stations, satellite reanalysis | | Economics | VOC per vehicle type, value of time, discount rate (typical 12% for developing nations), construction unit costs | National statistics, tender data |

HDM-4 operates through four primary analytical modules: hdm-4 software

Authored by Henry G. R. Kerali, this is the primary executive summary of the HDM-4 system. | Data Layer | Key Inputs | Typical

: Simulates road deterioration over time based on traffic, climate, and materials. : Simulates road deterioration over time based on

This feature allows road agencies to predict the future condition of a road network based on current data and simulate the impact of different maintenance strategies.