Aerial view of M4 motorway

M4 Smart Motorway project

The NSW Government is investing $600 million to build the M4 Smart Motorway project, which will introduce intelligent technology to the M4 Motorway between Pitt Street, Mays Hill and Mulgoa Road, Penrith.

Latest news

09 MAR 2020

09 MAR 2020Speed limits

The M4 Smart Motorway work is nearing completion and sections of the motorway will return to the original speed limit. Where construction continues on the Motorway, temporary speed limits will remain in place.

In March 2020, the following sections of the Motorway are being reinstated to the original speed limits:

  • M4 Motorway - entry and exit around the M7 ramps
  • M7 ramps near the M4 Motorway

In February 2020, the following sections of the Motorway were reinstated to original speed limits:

  • Westbound between Cumberland Highway and Wallgrove Road
  • Eastbound between Reservoir Road and Coleman Street
  • Eastbound at Orchard Hills

In November 2019, the following sections of the Motorway were reinstated to original speed limits:

  • Eastbound and westbound between Mulgoa Road and the Northern Road
  • Eastbound between Orchard Hills and Roper Road
  • Westbound between Wallgrove Road and The Northern Road
  • Westbound between Burnett Street and the Cumberland Highway

The following sections will remain at temporary 80km/hr speed limit while work continues:

  • The eastbound section between Coleman Street and Church Street 

Speed limits for this area will be reinstated as work continues. Please see the map for details of the speed limit reinstatement (PDF, 48Kb).

04 FEB 2020

04 FEB 2020Ramp meter trial

A second ramp meter trial is being held on the eastbound and westbound Reservoir Road on ramps in February from 11-13 February and 18-20 February during peak periods.

Ramp meters at each entry ramp will control traffic entering the M4 with ramp metering signals to improve traffic flow. The combined intelligent traffic technologies will help deliver faster, reliable and safer journeys. View more information about the ramp meter trial.

Interactive map

View ramp closures plus heavy vehicle height and width restrictions. See the interactive map.

View the M4 Smart Motorway map fullscreen.

Project information

When the M4 Smart Motorway is complete in 2020, ramp meters will operate at entry ramps between The Northern Road, Penrith and Pitt Street, Mays Hill.

Ramp meters at each entry ramp will control traffic entering the motorway with ramp signals to improve traffic flow.

A ramp meter trial is scheduled for the eastbound and westbound Reservoir Road on ramps from 11-13 February and 18-20 February during peak times. The ramp signals will be active during the morning and afternoon peak periods on selected days.

The objectives of the trial is to:

  • Demonstrate the signs and functions of M4 ramp metering to road users
  • Capture and analyse driver behaviour
  • Analyse system performance.

 The trial will inform the future transition of driver behaviour on the M4 when ramp metering is active in 2020. An initial ramp metering trial was held in August 2019.

The M4 Smart Motorway project, due for completion in 2020 will be delivered in stages, which will help limit disruption along the motorway, and ensure we keep people moving.

From June 2019, Roads and Maritime will be installing 46 overhead gantries along the M4 Motorway between Mays Hills and The Northern Road.

When the project is complete, the gantries will provide motorists with information on current or alternate speed limits and lane status.

Gantry installations will require sections of the M4 Motorway to be closed in both eastbound and westbound directions over five hours between the hours of 11pm and 4am.

For more information about the gantry installation program, follow the link to the Gantry Installation FAQs.

  • Stage 1 - Mamre Road, St Marys to Reservoir Road, Prospect
  • Stage 2 - Reservoir Road, Prospect to Pitt Street, Mays Hill
  • Stage 3 - Mulgoa Road, Penrith to Mamre Road, St Marys

For more information about each stage of work and the upgrades in your area, follow the link to our interactive portal.

The M4 Smart Motorway Project includes a 35 kilometre upgrade along the M4 Motorway from Lapstone to Mays Hill, and will provide a tailored technology solution to create a better travelling experience for motorists, and a more consistent journey.

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 M4 Smart Motorway will be the first smart motorway for NSW and will bring together intelligent traffic technologies in one place to maximise the performance of the motorway.

More information

For safety reasons, there will no cyclist access on the M4 Motorway between Mamre Road and Reservoir Road from Friday 1 December until project completion in 2020. Please see our cycle detour map.

Register for mobile phone SMS and email updates for the M4 Smart Motorway project, including upcoming ramp closures, M4 motorway closures and project developments.

Western Sydney is Australia’s third largest economy and in its own right would be Australia’s fourth largest city. During the next 20 years the region is expected to grow from two million to three million people, which is why the NSW Government is investing money into significant road infrastructure.

For more information about our projects in your area, see the Projects section.

M4 Smart Motorway map

View or download the M4 Smart Motorway map.

Community information


Contact us

If you have any questions or concerns about the project, please contact us by:

Phone: 1800 989 929


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