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M4 Junction 3 to Junction 12

Services: Planning & Controls

Value: 586.4 to £862.4 Million

Sector: Highways

The M4 motorway (M4) is the main strategic route between London, the west of England, and Wales. It connects directly to the M25 and Heathrow Airport.

The M4 carries over 130,000 vehicles per day and currently suffers from heavy congestion making journey times unreliable.

Traffic flows on the M4 are forecast to increase to an average of 160,000 vehicles per day over the next 20 years. This will result in even more congestion if nothing is done.

The scheme in detail

This scheme will use the latest technology to improve journeys by monitoring traffic flow and setting speed limits accordingly. This helps to keep traffic moving smoothly, instead of continually stopping and starting.

Information about road conditions and speed limits will be displayed to drivers on electronic road signs.

The proposal also involves converting the hard shoulder permanently to a traffic lane. This will create much needed extra capacity necessary to support economic growth.

The conversion of the hard shoulder will be continuous through junctions unless there is an operational reason not to do so.

We propose that the new lane created from the hard shoulder would continue through junctions 4, 5, 6, 7, 8/9 and 11. We aren’t proposing this for junctions 3 and 12 or at junctions 4b and 10, as these are motorway to motorway links.

To enable the provision of a smart motorway along the whole length of the proposed scheme, it will be necessary to widen or replace a number of bridges where there is currently no hard shoulder.

Working to support Corderoy’s Commercial Assurance Team for 32 miles of the M4 between Junction 3 (Hayes) and Junction 12 (Theale) converted into a ‘smart motorway’, which includes turning the hard shoulder into an additional lane and the installation of new technology on the motorway which will help keep traffic flowing and tackle congestion.

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