M12 Motorway

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Motorway capacity in Western Sydney
High Priority Project
Western Sydney, NSW
Fast-growing cities
Efficient urban transport networks
Problem/Opportunity timeframe
Near term (0-5 years)
Proposed By
NSW Government
Evaluation Date
18 June 2020
graphic representation f a map (M12 motorway)

Problem to be addressed 

The population in Western Sydney is anticipated to increase from 2.1 million in 2016 to 3.0 million by 2036. This growth and a number of planned developments, including the Western Sydney Airport, is expected to put significant pressure on the existing transport network, including the current main east–west route along Elizabeth Drive.

Traffic modelling undertaken by Transport for NSW indicates that the existing transport network will not be able to sufficiently and efficiently service future demand.
Additional pressure on the network  is expected to increase safety risks,  worsen travel outcomes and affect  planning and development undertakings within the region. 

Project description 

The M12 Motorway will be a new 16 km dual-carriage motorway and is part of the Western Sydney Infrastructure Plan. It will connect the Westlink M7 Motorway to The Northern Road, which is a major north–south corridor and is undergoing a significant upgrade as a component of the Western Sydney Infrastructure Plan.

The motorway will have two lanes in each direction, a central median allowing future expansion to six lanes, and provide interchanges connecting The Northern Road, Western Sydney Airport and the M7 Motorway.

The project will also construct several bridges:

•    across Kemps Creek, South Creek, Badgerys Creek and Cosgroves Creek
•    across the M12 Motorway
•    across the interchanges and other local roads.

The existing bridge across Ropes Creek and Villiers Road will also be widened. The M12 Motorway also includes active-transport facilities and connections. 
Local networks will be modified to connect across and around the motorway. 

Economic, social and environmental value

Economic benefits of the project include travel-time savings and vehicle operating cost savings. Other benefits include road safety benefits, a reduction in travel-time variability.

The proponent’s stated benefit–cost ratio is 1.8, with a net present value of $1,170.7 million (7% real discount rate).