Methodology Fact Sheets

Valuing life and the cost of a serious injury – This paper from Dahdah and McMahon provides a practical, useable answer for any country at any point in its state of economic development.

Presented at the Innovation Workshop 2026 by National Highways UK

For v3.10 only – This specification sets out the requirements for road coding data files to be uploaded into ViDA.

For v3.02 only – Presents guidelines for the coding of road attribute data, which is part of the process of producing Star Ratings and Safer Roads Investment Plans (SRIP).

For v3.10 only – Presents guidelines for the coding of supporting data, producing Star Ratings and tailoring Safer Road Investment Plans, analysis and reporting, performance tracking and implementation support.

For v3.10 only – Presents guidelines for the coding of road attribute data, which is part of the process of producing Star Ratings and Safer Roads Investment Plans (SRIP).

This consolidated reference guide fully describes the iRAP models and risk factors, as well as the evidence which underpins these.

We take your privacy seriously and want you to understand our practices with respect to the handling of your personal data. This privacy statement explains how we do this.

Details the changes made to the crash risk models, risk factors and coding guidance.

It is well known that different road features contribute to the likelihood and severity of crashes. Changing or upgrading these road features may reduce risk. This case study is one of a series carried out on roads in the UK to demonstrate a process of road assessment and crash reduction where Crash Risk Mapping can guide a selective Star Rating process.

The information detailed in this Case Study has been provided by RSI ‘Panos Mylonas’. The National Road 90 or North Road Axis of Crete (NRAC) is located on the island of Crete (South of Greece) and extends from one end of the island to the other (Kissamos to Sitia).