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.
The M12 Motorway will be a new 16-kilometre dual-carriage motorway an 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 also 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.
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 savigs 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).
At the time of evaluation, approved funding for this project totalled $1,812 million, indicating a gap of $75.5 million between the approved funding and the business case cost estimate of $1,887.5 million (P50, nominal, undiscounted).