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Infrastructure ratings

Star Ratings

iRAP Star Ratings are used for road safety inspection, road safety impact assessments, and in designs. Star Ratings are an objective measure of the level of safety which is ‘built-in’ to the road through more than 50 road attributes that influence risk for vehicle occupants, motorcyclists, bicyclists, and pedestrians.

Star Ratings reflect the risk as it relates to an individual road user. 1-Star roads have the highest risk and 5-Star roads the lowest risk. Star Ratings can be produced without reference to detailed crash data.

The Star Rating models underpin FSI Estimations and Investment Plans, all of which are integrated in iRAP’s online platform, ViDA.

Specifications and manuals for Star Rating Assessments are available at There are also a range of tools available that can help, including the Star Rating Demonstrator for small assessments of one or more locations, the Star Rating for Designs web application for moderate-size assessments and design assessments.

Did you know you can have your roads and designs formally iRAP certified as 3-star or better? Official certification provides a communications opportunity to celebrate the achievement of a Star Rating target and provide formal verification of the status of a road or design. Visit for more information.

Star Ratings

Star Rating process:

Examples of Star Ratings for different road users

Watch the Introduction iRAP Star Rating, FSI and SRIP viewer video

Watch the Introduction iRAP Star Rating, FSI and SRIP engine video

Road attributes
Risk worms
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