Application of infrastructure risk rating (IRR) to support speed limit reduction in Western Australia
Submission Date: 2019
The Infrastructure Risk Rating (IRR) methodology developed in New Zealand assesses road safety risk based on infrastructure, roadside hazards and land use elements. The methodology was applied to 110km/h posted speed limit state roads in Western Australia (WA) to support speed limit review. After identifying medium to high-risk road sections based on IRR scores, stakeholders reviewed the results, considering route hierarchy, surrounding network and implementation issues. As a result, a number of road sections were identified as priority sections that warrant speed limit reduction.