M4 Smart Motorway project

The M4 Smart Motorway project will introduce intelligent technology, known as a Smart Motorway system, to Sydney’s M4 Motorway between Pitt Street at Parramatta and the Great Western Highway at Lapstone.

Updates and announcements

Roads and Maritime has invited tenders for the detailed design and are expecting to award in mid-2016. Read the media release for more information. Construction is expected to start in 2017 and be completed within three years.

About the project

Smart Motorways, also known as ‘managed motorways’ use complementary technologies to monitor traffic conditions, manage congestion and respond to incidents in real-time.

The M4 Smart Motorway will introduce a smarter way of travelling the M4 by using real-time information, communication and traffic management tools to provide motorists with a safer, smoother and more reliable journey.

The project would connect with the WestConnex project at Mays Hill.

More information

Current status

The M4 Smart Motorway project was approved in October 2015. The next stage is detailed design including further field investigations, traffic and noise modelling, identification of noise mitigation measures and consultation with property owners, councils and other stakeholders. Tenders for detailed design are expected to be invited by November 2015.

Timing of construction has not yet been confirmed but is expected to start in 2017 and be completed within three years, subject to weather.

Roads and Maritime Services will continue to liaise with the community and stakeholders throughout the project and will notify residents before any additional field investigations are carried out.


A REF was prepared to assess the potential environmental impacts of the M4 Smart Motorway proposal and recommend measures to minimise these impacts. The REF is available to view or download from the Documents and maps page.

The proposed concept design and REF were displayed for community comment from 12 March to 10 April 2015. Comments closed on 10 April 2015.

Submissions were received from 36 individuals and organisations. Most supported the proposal while raising issues such as operational noise, construction and traffic impacts. A submissions report has been prepared responding to the issues raised.

The REF Submissions Report summarises the issues raised, provides responses to each issue, details additional investigations carried out since the REF went on display and identifies new or revised environmental management measures. It can be viewed or downloaded from the Documents and maps page.

Process flow chart - text description provided below.

The process:

  1. Carry out preliminary investigations and field work
  2. Carry out environmental assessment
  3. Review of Environmental Factors displayed for community comment
  4. Project approval for the final concept design - we are here
  5. Detailed design
  6. Construction in future years subject to funding.
Share this page: