Thursday, 10 September 2026
Austroads has updated its Guide to Pavement Technology Part 4A: Granula Base and Subbase Materials, with Edition 2.0 introducing targeted improvements to support a more efficient, effective approach across Australia and New Zealand.
This updated edition ensures practitioners continue to have access to contemporary, evidence-based guidance on the selection, testing and specification of crushed rock and naturally occurring granular materials for use in pavement base and subbase. The Guide examines the role and function of these materials within pavement structures, outlines the physical properties that influence performance and durability, and addresses the production and use of natural, manufactured and recycled materials.
Edition 2.0 includes:
- improved clarity and formatting
- additional text related to recycled materials
- editorial updates throughout the Guide.
Ross Guppy, Austroads Program Manager, Transport Infrastructure, said the revised Guide reflects Austroads’ ongoing focus on maintaining contemporary, high-quality technical guidance.
“The update has been informed by collaboration with practitioners and subject matter experts from across Australia and New Zealand, ensuring the Guide continues to provide practical and relevant support for the pavement industry.”
“As a trusted resource for the sector, the Guide brings together current knowledge, research and industry experience to support consistent and informed decision-making.”
The updated Guide reflects advances in pavement materials, design approaches and industry practice, ensuring the design method remains relevant to the needs of road agencies and practitioners across Australia and New Zealand. It incorporates the latest research and industry feedback to support more informed and consistent pavement design outcomes.
Guide to Pavement Technology Part 4A: Granula Base and Subbase Materials also covers specification approaches, quality management processes and quality assurance requirements, supporting practitioners to make informed material selection decisions and achieve consistent pavement performance outcomes.