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The National Transport Research Organisation (NTRO) is a trusted advisor and partner to all levels of government in Australia, New Zealand and the Pacific region across all modes of transport – road, rail, ports and airports.

NTRO supports the CIRCLY, HIPAVE and APSDS pavement design packages.

NTRO has more than 60 years’ experience in transport research. Formerly the Australian Road Research Board (ARRB), our continuous service to the road and transport sectors of Australia and New Zealand stretches back to 1960.

NTRO is innovation driven, delivering innovative transport solutions that are safer, more sustainable and value-for-money.

PAVEMENT DESIGN AND ANALYSIS

We are the developers of leading edge software for pavement design and analysis:

CIRCLY

CIRCLY is the leading general purpose pavement design package.  CIRCLY is an integral component of the AUSTROADS Australian Pavement Design Guide.  CIRCLY 7.0 fully automates Haul Road Design. 

APSDS

APSDS (Airport Pavement Structural Design System) is the leading edge pavement design package for Airport Pavements. 

HIPAVE

HIPAVE is advanced software for design of heavy duty industrial pavements such as intermodal container terminals. 

Contact us or our distributors for further information.

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The information provided on this website is for general information purposes only and is not intended as professional, legal, or technical advice.

While every effort has been made to ensure the accuracy and currency of the information, ARRB Group Ltd trading as the National Transport Research Organisation (NTRO) makes no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability of the content contained on this website or on any linked third-party site.

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Last updated 03 July 2025.