Star Rating for Design (SR4D) is a free tool and evidence-based programme of applications informed by the iRAP Methodology which enable the simple and objective measure, and improvement, of the level of road safety ‘built in’ to a road design for vehicle occupants, motorcyclists, pedestrians and cyclists, before the commencement of civil works.

SR4D enables road engineers and designers, municipalities and road authorities, funding agencies and governments to make roads safer.

Ensuring the safety of a road design before it clears the design phase directly equates to lives and serious injuries saved on the street. Despite knowledge and free tools to improve design safety, unsafe 1- and 2-star roads are still being built.

SR4D strengthens the road safety audit process, complementing it with an objective and repeatable qualification of road user risk (without the need for a high level of experience), and supports the wider potential of Star Ratings as a safety performance metric and maximised safety in road infrastructure investment.

SR4D will be essential to supporting countries to achieve the United Nations Global Road Safety Performance Targets, especially Target 3 to ensure all new roads are built to a 3-star or better standard for all road users.

How to access the free-to-use Star Rating for Design tool

The tool is available as part of iRAP’s free-to-use toolkit making safer road design accessible for all, including low- and middle-income countries.

It is free for free for ViDA Creator account holders.

Watch this short video on how to access Star Rating for Designs through ViDA. All the iRAP road survey data gathered around the world, is processed through ViDA, our central database.

SR4D Training Opportunities


iRAP’s Star Rating for Designs 4 Part Video Training Series (complete at your own pace)

This webinar series will empower participants to use the iRAP Star Rating for Designs (SR4D) web app to assess
designs and help make roads safe before they are built.



SR4D webinar feedback and testimonials


Star Rating for Designs has been made possible through the financial support of the Global Road Safety Facility.

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