CIRCLY 5.0 is software for the mechanistic analysis and design of road pavements. CIRCLY uses state-of-the-art material properties and performance models and is continuously being developed and extended. From the first mainframe version of CIRCLY in 1977, to Version 5.0 (released in early 2004). It is an integral component of the Austroads Pavement Design Guide that is widely used in Australia and New Zealand.

CIRCLY calculates the cumulative damage induced by a traffic spectrum consisting of any combination of user-specified vehicle types and load configurations. As well as using the usual 'equivalent' single wheel and axle load approximations, optionally the contribution of each vehicle/load configuration can be explicitly analysed.

A Parametric Analysis feature can loop through a range of thicknesses for o­ne or two layers, while simultaneously designing the thickness of another layer. This feature will optimise up to three layers. Combining this with a Cost Analysis feature, allows for fine-tuning of layer thicknesses to minimize construction and maintenance costs.

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