Centenary Motorway capacity

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Southern Brisbane to CBD road network capacity
Priority Initiative
Brisbane, Qld
Fast-growing cities
Urban Congestion
Problem/Opportunity timeframe
Near term (0-5 years)
Proposed By
Queensland Government
Date added to the IPL
14 February 2019


The Centenary Motorway corridor connects Brisbane’s rapidly growing Western Corridor (Ipswich, Springfield and the Ripley Valley) to Brisbane’s inner north and the CBD. Between the Ipswich Motorway interchange in the south and Toowong in the north there are high volumes of traffic along the corridor. These result in road congestion and poor trip reliability and road safety.

Projected population growth in the Western Corridor, combined with a growing number of people commuting from these areas to Brisbane’s CBD for work, will exacerbate the problem in the future. Ipswich is expected to have the largest population growth of any Local Government Area within South East Queensland from 2016 to 2041 – with an additional 393,000 residents and 61,000 jobs.

Average weekday traffic on the Centenary Bridge was approximately 100,000 vehicles per day in 2016 and is estimated to rise to more than 150,000 vehicles per day in 2036. There were 192 crashes recorded on the Centenary Motorway between 2010 and 2016, and increasing congestion will contribute to further safety issues.

Proposed initiative

 Options to improve capacity along the motorway include: 

  • intersection and on-ramp and off-ramp
  • implementing smart freeway
  • road widening. 

Next steps

Proponent to identify initiatives and develop options (Stage 2 of Infrastructure Australia’s Assessment Framework).