Tools
Infrastructure Risk Rating Tool
The Infrastructure Risk Rating Tool (IRRT) produces network-level infrastructure risk ratings for road sections, using coded attributes such as cross-section, alignment, intersection density, speed environment, and roadside hazard. The output is a comparable risk rating that lets road agencies prioritise investment across long networks without waiting for crashes to accumulate. IRRT complements crash-based analysis by surfacing high-risk roads that have not yet generated visible crash history.
In practice, IRRT guides you through a structured, repeatable assessment so options can be compared and prioritised consistently.
View more about this topicProvides evidence-based scoring and ranking to support treatment selection, investment prioritisation, and network-wide decision-making.
Use IRRT when you need to:
Use IRRT when you need to baseline the safety performance of a large road network, target your Network Safety Plan effort, support a funding submission with proactive risk evidence, or monitor change in network risk over time. It is particularly valuable on rural and outer-suburban networks where crash frequencies are low but crash severities are high.
The tool is delivered as a web application. Typical workflow:
Upload your network data (geometry, cross-section, coded attributes) into the IRRT model, run the rating calculation, and export the per-section rating outputs as both spreadsheet and map layers. The map outputs are designed for use in capital-program planning workshops; the spreadsheet outputs feed downstream into treatment-selection and Network Safety Plan workflows.
Guides & Manuals
Supporting documentation for IRRT users.