Key features of the proposed M4 Smart Motorway

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

Key features

Variable Message Signs on the motorway and approach roads. These electronic signs would inform drivers about expected travel times and traffic conditions ahead, allowing drivers to better plan their journey or choose an alternative route.

Ramp metering on entry ramps helps to smooth traffic flow onto the motorway. These are quick change traffic lights that will manage the flow of vehicles entering the motorway. They will make merging safer and easier and reduce the risk of drivers having to brake suddenly. They will operate in peak periods or in heavy traffic.
For more information, read the entry ramp metering fact sheet.

Lane use signs to open and close lanes in response to incidents.

Variable speed limit signs to vary speed limits if there is heavy traffic, an incident or bad weather.

Additional traffic sensors and CCTV cameras to continually monitor traffic conditions.

Additional emergency telephones and maintenance bays to provide drivers with improved safety when their vehicle breaks down or if there is an emergency stop required.

Improvements to interchanges from Mays Hill to Lapstone

Improvements to interchanges:

  • Entry ramps at key interchanges will be realigned, extended and widened to smooth traffic flow onto the motorway
  • Some exit ramps will also be realigned, extended and widened to reduce queuing onto the motorway
  • Traffic signalling improvements and minor adjustments will be made at some intersections.

Widening the motorway between the M7 Motorway and Roper Road interchanges to four lanes in each direction to improve traffic flow.

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