M4 Smart Motorway - Stage 2 and Stage 3

Project Location

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Project Description

Seymour Whyte is delivering Stage 2 and Stage 3 of the M4 Smart Motorway, with preliminary works already underway and major construction planned to commence in July.

The project will see construction of the New South Wales' first smart motorway, introducing intelligent technology to Sydney’s roads that will help manage traffic congestion and prevent crashes.

Both stages of the project will involve realignment, extension and widening of ramps with ramp meters and ramp control signs at Burnett Street, Coleman Street and Cumberland Highway for Stage 2 and Mamre Road for Stage 3; plus installation of maintenance bays, vehicle detection loops and upgrades to existing power and communications infrastructure.

Variable message signs, traffic sensors, CCTV, and speed and lane use signage will also be installed as part of the project between Parramatta and Penrith. Stage 2 and Stage 3 form part of the overall 36km stretch of the M4 Smart Motorway, which has been divided into several packages and is expected to cost a total of $470 million. The project is funded by the NSW government.


May 2018 to 2020

Transport for New South Wales (TfNSW)

Contract value
AU$200-210 million