Our Team

Some of our team members

James Laidler

Senior Traffic Engineer

James is a Senior Traffic Engineer and has a Bachelor of Civil Engineering , with a Diploma in Engineering Practice, and has been working as a traffic engineer in the transport planning and transport construction industries for over 11 years.

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During this time, James has been involved in numerous projects for both private organisations and government agencies, including CPB Samsung John Holland Joint Venture (WestConnex M4 Extension Joint Venture) and The Hills Shire Council.

Past projects have ranged in size from detailed design advice in relation to concept suburb masterplans, intersection upgrades, to the preparation of due diligence advice, Construction and Operational Traffic Management Plans, Traffic Guidance Schemes, Pre-and post-construction Design Statements, and Traffic Impact Assessments.

James has undertaken internal road safety inspections post major road works and has experience dealing with the Transport Management Centre to obtain Road Occupancy Licenses.

Furthermore, James has been trained in and worked with transport planning models, and this experience allows him to give specialist advice on transport planning and construction issues. These models and programs include AutoCAD Vehicle Tracking, SIDRA and Rapid plan.

James has a comprehensive understanding of traffic and transport regulations and can deliver balanced transport solutions for liveable, equitable and connected spaces. James relishes the challenges faced by traffic engineers and seeks to provide holistic solutions to create better experiences for motorists and pedestrians.

Ason Groups:

Other Key Personnel:

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Becky is a Senior Transport Planner with over 8 years’ experience in local government and private consultancy fields.

Rebecca Butler-Madden

Principal Transport Planner

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Piran Trethewey, a founding director of Ason Group, is an experienced traffic engineer with expertise in the areas of traffic engineering analysis and assessment.

Piran Trethewey


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Andrew Johnson, a founding director of Ason Group, is a Civil Engineer with over 20 years of experience in the Transport Planning and Engineering industry.

Andrew Johnson