Software: Hdm-4

HDM-III became the baseline international tool for more than two decades, evaluating low-to-medium volume corridors in developing countries.

: Focuses on prioritizing road sections for maintenance within a specific multi-year budget. Project Analysis

While HDM-4 remains a powerful and supported tool, the world has changed significantly since its last major update. To meet modern challenges like climate change, sustainability, and new technology, the World Bank and TRL have embarked on a project to develop —not just an update, but a complete reinvention. hdm-4 software

Modeling the economic impact of traffic accidents related to road geometry or conditions. Key Benefits of Implementing HDM-4

┌───────────────────────────────────────┐ │ HDM-4 SOFTWARE │ └───────────────────┬───────────────────┘ │ ┌─────────────────────────────────┼─────────────────────────────────┐ ▼ ▼ ▼ ┌──────────────────┐ ┌──────────────────┐ ┌──────────────────┐ │ Project Analysis │ │ Program Analysis │ │ Strategy Analysis│ ├──────────────────┤ ├──────────────────┤ ├──────────────────┤ │ • Single segments│ │ • Multi-year rolling│ │ • Entire network │ │ • New designs │ │ work schedules │ │ long-term budget│ │ • Feasibility │ │ • Priority ranking│ │ • Policy impacts │ └──────────────────┘ └──────────────────┘ └──────────────────┘ 1. Project Analysis HDM-III became the baseline international tool for more

This is the "big picture" tool. Users can define budgets (e.g., $50 million per year) and let HDM-4 optimize which roads get fixed to maximize the network's Net Present Value (NPV) or minimize User Costs.

The roots of HDM-4 lie in the original developed by the World Bank in the 1970s. This evolved into HDM-III in the 1980s, which became the global benchmark for road investment appraisal. Project Analysis This is the "big picture" tool

Evaluates the economic viability of specific road projects, comparing investment options against a "do-nothing" scenario.

HDM-4 produces both tabular and graphical outputs: