The Department of Transport and Main Roads (TMR) has identified the need to upgrade the Yatala South Interchange (Exit 41) on the Pacific Highway (Pacific Motorway M1) to improve traffic flow, increase efficiency at the interchange and improve reliability of access conditions for freight movements and transit times for all motorway users. 

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ARUP has been commissioned by TMR to prepare the preliminary design as part of the Development Phase to upgrade the Exit 41 interchange, from which ARUP subsequently engaged Geleon to prepare the P90 Total Project Cost Estimate for the works in accordance with Transport and Main Roads (TMR) Project Cost Estimating Manual. 

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A cost estimate using a combination of unit rates and first principles methods was prepared that determined Construction Contractor's Costs, Principal's Costs, considered Planned and Unplanned Risks, Escalation and utilised @Risk software to perform a Monte Carlo simulation to ascertain the Total Project Cost at 50 and 90-percentile likelihoods. Estimated costs were then separated into Capex and Opex cost elements in accordance with Section 8 - Work Breakdown Summaries of the Transport Infrastructure Cost Classification Guide for Recording Expenditure - Implementation Guide for the TMR Infrastructure Asset Accounting Policy and Cost Breakdown Structures.