What’s New

2019 Austroads Pavement Evaluation and Treatment Design Guide Released

AGPT05-19 : Guide to Pavement Technology – Part 5: Pavement Evaluation and Treatment Design was released in July 2019.

In edition 4.0:

  • Changes have been made to the mechanistic-empirical design of strengthening treatments for flexible pavements
  • A new design process for calculating granular overlays using Traffic Speed Deflectometer deflections has been added
  • Asphalt overlay design charts have been deleted


See also the Webinar presented by Geoff Jameson and Dr Michael Moffatt.

New south australia DPTI Supplement to Austroads Guide to Pavement Technology

Department of Planning, Transport and Infrastructure (DPTI):
Supplement to the Austroads Guide to Pavement Technology Part 2: Pavement Structural Design.

The purpose of this Supplement is to provide more specific procedures and direction when using the Austroads methodology for the design of new pavements for the Department of Planning, Transport and Infrastructure, a South Australian State Government Department.

This Edition published September 2019.

Download these 2 files from here:


DPTI Circly 7.0 TLD CSV Files

New New South Wales Roads and Maritime Supplement to Austroads Guide to Pavement Technology

This supplement is issued to clarify, add to, or modify the Austroads Guide to Pavement Technology, Part 2: Pavement Structural Design (2017).
NSW Roads and Maritime Services accept the principles in the Austroads Guide to Pavement Technology, Part 2: Pavement Structural Design (2017) with variations documented in this supplement.

Document No: RMS 11.050 Version 3.0 | August 2018
Supersedes: RMS 11.050 Version 2.2

Download from here.


Warning:  The Traffic Load Distributions (TLDs) as provided in Appendix B of the Code (versions prior to December 2018) and in the current CIRCLY 7.0 software are incorrect.
A new version of CIRCLY 7.0 that will automatically update the Vicroads TLDs will be issued released in the next few weeks.

Code of Practice. RC 500.22. Selection and design of pavements and surfacings. December 2018.

Vicroads has updated RC 500.22 to reflect changes in Austroads Guide to Pavement Technology – Part 2: Pavement Structural Design (AGPT02-17) (released in December 2017).

If Weigh in Motion data is not available or specified, Traffic Load Distributions (TLDs) as provided in Appendix B of the Code for the appropriate road class shall be used.  The 12 TLDs defined in Appendix B are pre-loaded into CIRCLY 7.0, as shown below:

This Code sets down VicRoads procedures for the selection and design of new road pavements and surfacing.

The Code includes important information on Selection of Asphalt Types and typical characteristics of asphalts commonly used by VicRoads.

You can download the Code from here.

NEW Queensland Pavement Design Supplement

The July 2018 edition of the supplement replaces the 2017 Pavement Design Supplement. The supplement has been updated primarily to align with the December 2017 version of AGPT02.

The Pavement Design Supplement sets out supplementary and specific requirements for the design of pavements for Main Roads. It includes Main Roads requirements for pavement types, reliability, subgrade assessment, climatic considerations, material characterisation, traffic, design and comparison of designs.

Further details here.

New Zealand guide to pavement structural design updated to latest Austroads Part 2

The 2017 New Zealand Guide to Pavement Structural Design replaces the New Zealand Supplement to the Document, Pavement Design – A guide to the structural design of road Pavements (Austroads 2004) written by Transit in 2007.
This Guide includes additional guidelines for the Engineer in applying the Austroads design procedures resulting from research results and experience gained in New Zealand. The aim is to minimise confusion and promote consistency in design assumptions applied in New Zealand.

This version of the New Zealand guide to pavement structural design is to be used for the design of new pavements.

For rehabilitation refer to the New Zealand guide to pavement evaluation and treatment.


CIRCLY 7.0 gives Reduced Asphalt Thickness for Heavy-Duty Structures

The following graph illustrates the considerable reduction in Asphalt thickness for pavements at higher traffic loads designed with CIRCLY 7.0 (using the Austroads 2017 Design Method), compared to CIRCLY 6.0 (using the Austroads 2004-12 Design Method).

This leads to reduced material and construction costs.

after Webinar presented on 9 March 2018 by Dr. Michael Moffatt (ARRB) – Pavement Design – Guide To Pavement Technology Parts 2 And 4C (2017 Editions)


CIRCLY 7.0 has just been released.

You can get an Overview of CIRCLY 7.0 by starting here.

Then click the Next > button at the bottom right hand corner on each page.

The Austroads Pavement Structural Design Guide has undergone a major revision that was released in December 2017.

The major change is how the details of the Traffic Load Distribution (TLD) are used as design inputs. The Traffic Load Distribution consists of the frequency distribution of Axle Group Loads.

Here’s an example of CIRCLY 7.0‘s Traffic Load Distribution screen:

CIRCLY 7.0 - Example Traffic Load Distribution

You can upgrade to CIRCLY 7.0  – at no extra cost if you have a current CIRCLY Annual Subscription.

CIRCLY 7.0 Tutorials Launched!CIRCLY 6.0 Tutorials Word Cloud

CIRCLY 7.0 Tutorials Word Cloud

We are pleased to announce that the CIRCLY 7.0 Tutorials are online.

Haul Road Design website launched!

We have just launched the Haul Road Design website – a rich resource for Articles, Papers, Reports and Software for Mine Haul Road Design.


CIRCLY 7.0 – What’s New for CIRCLY 5.x Users

See this page.

Convert your CIRCLY 5.x data to CIRCLY 6.0

We now have the CIRCLY 5.x to CIRCLY 6.0 Data Converter.
It will convert all of your CIRCLY 5.x data to CIRCLY 6.0.
Please contact Mincad Systems for more details.


Mine Haul Road Design Automated with CIRCLY 7.0 – a World First!

CIRCLY 7.0 software can design unpaved mine haul road pavements trafficked by heavy mine vehicles and dump trucks etc.

CIRCLY 7.0 fully automates the South African design method – the state of the art in haul truck pavement design.
See these pages for an overview of the CIRCLY 7.0 Haul Road Pavement Design Feature.


The Centre for Pavement Engineering Education (CPEE) will be presenting the following Short Courses/Workshops this year:

Mechanistic Pavement Design – CIRCLY

This one day course provides delegates with an understanding of the theoretical basis of mechanistic pavement design methods and is a hands-on course with each student having access to a PC. The course is offered as a single day for those who are well versed and practiced in pavement design, or who have completed any of the past CPEE two day Pavement Design courses, or for those who are attending the current Pavement Design – Principles & Practice 2 day course.
The course provides an introduction to flexible pavement design models using CIRCLY 7.0 focusing on the 2017 Austroads Guide to Pavement Technology – Part 2: Pavement Structural Design (AGPT02-17).
The workshop will also include an introduction to heavy duty pavement design for container terminals and airports.

Course brochure.

These courses are recognized by Engineers Australia for Continuing Professional Development (CPD) purposes.

Note that

You can also download the CIRCLY 7.0 Workshop slides (you will need to Register and Log-in to access this content. Click here to get started):

Another very useful resource is the webinar by Dr. Michael Moffatt (ARRB).
The webinar is here. The slides are here.


The  CIRCLY 7.0 User Manual cannot be printed but is a expanding live collection of Online Tutorials.  They are more effective than a conventional User Manual and consist of text, graphics and videos.
Get started here.   (Register and Log-in to access this content. Click here to get started)

Workshop Calendar

Note: The CIRCLY and Heavy Duty Pavement Design Workshops are “hands-on” experiences with each student having their own PC – so 16 places only.

Additional Pavement related short courses are offered through The Australian Asphalt Pavement Association’s (AAPA) Training Centre. A full list of the courses on offer can be found on the AAPA website.

Register your details below if you are interested in attending a Workshop and would like to be notified when further details are available.


Please fill out this form

CIRCLY 5.0 Maintenance and Support discontinued

CIRCLY 5.0 Maintenance and Support was discontinued on 1 November 2012. The impact of this date depends on what type of CIRCLY Licence you have:

CIRCLY Annual Licence

If you have a CIRCLY Annual Licence:

You should upgrade to CIRCLY 5.1 or CIRCLY 6.0 (at no charge) as this will make sure that you have the most up to date version of the program.

To upgrade to CIRCLY 6.0 contact Mincad Systems.

To upgrade to CIRCLY 5.1:

Download the CIRCLY 5.1 installer from here.

Remember that if you intend to use Windows 8.1 or Windows 10, that you must install CIRCLY 5.1 or CIRCLY 6.0 (CIRCLY 5.0 cannot be used).

CIRCLY 5.0 Perpetual Licence

If you have a CIRCLY 5.0 Perpetual Licence:

A CIRCLY 5.0 Perpetual Licence allows you to use CIRCLY 5.0 for as long as you want. CIRCLY 5.0 will continue to run on any versions of Windows before Windows 8.

CIRCLY 5.0 will no longer be maintained or supported from 1 November 2012.

You will need to order a CIRCLY Annual Licence to keep receiving maintenance and support (or to use Windows 8 or any future version of Windows). You pay in advance for an Annual Licence. There are no further charges for support and maintenance and you receive major upgrades such as CIRCLY 6.0. The Annual Licence price may increase in future years in line with list prices.

Replacement CIRCLY 5.0 Hardware Locks

Please note: We will continue to replace any CIRCLY 5.0 Hardware Locks at the standard replacement charge (now $475 incl. GST and delivery) for an indefinite period.

CIRCLY and Mechanistic Pavement Design: The Past, Present and Towards the Future

It has been about 40 years since CSIRO released CIRCLY, originally a FORTRAN program for analyzing Layered Elastic Media subject to surface loads. This paper (CIRCLY and Mechanistic Pavement Design: The Past, Present and Towards the Future – Leigh Wardle (2010)) gives an overview of how CIRCLY has evolved – from the first mainframe version, to the current user-friendly Windows-based, version 6.0 as the standard pavement design package used in 35 countries. CIRCLY has closely tracked the Austroads mechanistic flexible pavement design procedure as it has developed.

Recorded Demonstrations

We now have a number of online recorded demonstrations of the new CIRCLY 5.0 features.

Sample Pavement Design Report (by Graham Foley)

As a service to our clients we are making available a Sample Pavement Design Report written by a specialist pavement engineer, Graham Foley. This report is an example of using the general mechanistic procedure to refine an existing pavement design to give an alternative pavement design. It will be of use to both experienced and less-experienced pavement designers as how to approach and document a mechanistic design.

Download here: Sample Client Pavement Design Document 

CIRCLY receives high rating in European Pavement Design Study

Research by the European Economic Community has identified that a standardised European pavement design and maintenance strategy will lead to savings of billions of dollars in construction and maintenance costs. The first step in this standardisation process, the AMADEUS (Advanced Models for Analytical Design of European Pavement Structures) Project, a coordinated European Road Research Program formally commenced in January 1998.

The AMADEUS Project involved a team of 15 national partners (Great Britain, Germany, The Netherlands, Belgium, Portugal, Denmark, Austria, Spain, Greece, Sweden, Finland, Switzerland, Iceland, Slovenia, Hungary) and included national highway research institutions, universities and other road research organisations. The project reviewed current pavement design methods and software. CIRCLY was one of the few packages that was capable of being used in all the phases of the project and achieved good ratings in all categories.

Click here to download the 178 page Final Report.