This fact sheet provides an overview of the Star Rating and Safer Roads Investment Plan processes and a list of fact sheets in the series. Download below:

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• Spanish version
• Portuguese version

This fact sheet provides an overview of the Star Rating and Safer Roads Investment Plan development history.

This fact sheet provides an overview of the Star Rating and Safer Roads Investment Plan model version management.

This fact sheet provides an overview of the road users, crash types and crash initiation modes used in the models.

This fact sheet describes External Flow Influence factors, which account for the way in which traffic flows can affect the type of crash that an individual road user is involved in.

This fact sheet describes the iRAP Star Rating Score equations.

This fact sheet provides an overview of the process used to smooth Star Ratings.

This fact sheet includes a worked example of the way in which Star Ratings are calculated.

This fact sheet describes how the number of casualties (fatalities and serious injuries) is estimated and how the models are calibrated.

This fact sheet describes how the effectiveness of a countermeasure is estimated when it is used in combination with other countermeasures.

This fact sheet describes the economic analysis used to prioritise countermeasure options.

This fact sheet describes the background research and development associated with the Star Rating for Schools methodology.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Centreline Rumble Strips. Centreline Rumble Strips (also referred to as raised profile centre lines or audible centre lines) can be used to delineate the centre of paved roads. As well as providing visual delineation, Centreline Rumble Strips can also be heard and felt by drivers and riders.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Curvature. Curvature is a measure of the horizontal alignment of a road.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Delineation. Delineation is a measure of the road attributes that inform drivers of road conditions to keep them within the driven lane and aware of road ahead.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Facilities for Motorcycles. Facilities for Motorcycles records the presence of purpose-built facilities for motorised two wheelers.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Grade. Grade is a measure of the gradient of the road along its length. It refers to both upward and downward grades.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Intersection Type. Intersection Type records the presence and type of intersections with gazetted/adopted roads.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Intersection Quality. Intersection Quality is a measure of the intersection design, advance warning, signing, and marking.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Lane Width. Lane Width is the distance from the centre of the shoulder marking to the centre of the adjacent lane marking or the centreline marking.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Median Type. Median Type records the road infrastructure that separates opposing traffic flows.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Operating Speed and Mean Speed. Operating Speed is used in the calculation of Star Ratings and is the greater of the posted (or official) speed limit or 85th percentile speed. Casualty estimations and economic analyses (in the Safer Roads Investment Plans) are based on mean speeds.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Paved Shoulder Width.  Paved Shoulder Width refers to the driveable section of pavement outside the edge line.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Pedestrian Crossing Facilities. Pedestrian Crossing Facilities records the presence of purpose built facilities to assist pedestrians.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Pedestrian Fencing. Pedestrian Fencing records if there is a fence present that is sufficient to restrict pedestrian crossing flow.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Property Access Points. Property Access Points records the number of low-flow points where vehicles can enter or exit the roadway. This includes commercial and residential driveways and minor access lanes.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Quality of Curve. Quality of Curve is a measure how easy it is to judge how sharp a curve is and if it can be driven safely.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Roadside Severity – Object. Roadside Severity – Object records the nearest object that could result in death or injury to vehicle occupants, motorcyclists and bicyclists if struck. The object recorded is the same as that referred to in Roadside Severity – Distance.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Roadside Severity – Distance. Roadside Severity – Distance is a measure of the distance between the edge of the road and the nearest roadside object that would result in death or serious injury to a vehicle occupant, motorcyclist or bicyclist if struck.

The fact sheet covers the range of advance warning provided for schools.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Shoulder Rumble Strips. Shoulder Rumble Strips (also referred to as raised profile edge lines or audible edge lines) can be used to delineate the edge of paved roads. As well as providing visual delineation, Shoulder Rumble Strips can also be heard and felt by drivers and riders.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Sidewalk Provision. Sidewalk Provision refers to the provision of an area (a sidewalk or footpath) at the side of the road for pedestrians. The sidewalk can be either ‘formal’ or ‘informal’.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Sight Distance Restriction. Sight Distance Restriction refers to the ability of a driver or motorcycle rider to see pedestrians or bicyclists either in the roadway or about to cross the road ahead, or vehicles or motorcycles at an intersection.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Speed Management/ Traffic Calming. Speed Management/Traffic Calming records the presence of facilities judged to have the ability to reduce the operating speed 10km/h below the speed limit (on roads adjacent to or adjoining the traffic-calmed sections).

This factsheet describes the road attribute risk factors used in the iRAP methodology for Street Lighting. Street Lighting records the presence of lighting that is sufficient to provide illumination for vehicle occupants, motorcyclists, pedestrians and bicyclists.

This factsheet describes the road attribute risk factors used in the iRAP methodology for Vehicle Parking. Vehicle Parking records the extent to which there is parked vehicles obstruct pedestrians or bicyclists.