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The Roadside Impact Severity Calculator (RISC) is a free application developed by Transport and Main Roads based on a methodology established by the American Association of State Highway Transport Officials (AASHTO) published in the Roadside Design Guide.

RISC allows the user to input road and hazard characteristics, together with potential treatment options.

The software performs a quantitative economic evaluation of hazardous roadside objects by calculating a benefit cost ratio for treatment options. Designers can then select a treatment, based on the goal of achieving a return on investment consistent with other road infrastructure projects.

RISC is intended to be used in conjunction with the Department’s Road Planning and Design Manual 2nd Edition Volume 3, Part 6 “Roadside Design, Safety and Barriers”.

Installation – RISC V6.0.0.1 (01/2017)

  1. Download the file 'RISC6001setup.exe' to a temporary directory. 
  2. As Administrator, run 'RISC6001setup.exe' to install RISC. The RISC software will be installed in the directory you nominate during the install process and a TMR.RISC shortcut will be created in Start > All Programs > TMR.RISC.
  3. Refer to ‘RISC > Help > RISC Version Notes’ for What’s new in this version.


To be notified of updates to RISC, email Register Contact Details and provide your contact details in the e-mail body.

Crash cost

The installation includes current crash costs for utilisation in the RISC program that were current at the time of release. Users of RISC should seek advice from the Project Manager regarding which set of crash cost values to use.

The following historic values are provided for reference.

RISC historic crash cost updates

System requirements

  • Windows XP
  • Windows 7 32/64

For more information contact Engineering and Technology Branch via the Service Centre:

Service Centre
Phone: (07) 3066 2000

Last updated
17 September 2021