The Tonkin Gap Project will address the current bottleneck where the highway reduces from three lanes to two in Bayswater and Redcliffe, significantly reducing travel times and improving safety.

The Associated Works will provide rail-enabling works for the METRONET Morley-Ellenbrook Line along Tonkin Highway, including underpasses and dive structures, to enable trains to enter and travel along the median of Tonkin Highway then exit in Malaga.

LLWA started this project in 2020. LLWA is the main sub-contractor on this project with multiple technicians attending sites daily to complete Field Testing. Samples are collected for further testing at our base lab. Testing methods for this project have followed Main Roads WA and Australian Standards methods.

Over 6000 samples so far have been tested at our base lab since the project started, including:

• Moisture Content
• California Bearing Ratio
• Particle Size Distribution
• Perth Sand Penetrometer
• Foreign Materials
• Calcium Carbonate Content
• Atterberg Limits, Including Plastic Limit, Liquid Limit, Plastic Index and Linear Shrink
• Maximum Dry Density – Standard and Modified

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