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Public exhibitions to be held ahead of start of M4 'smart motorway' construction

A series of drop in events next month will give residents the chance to find out about the next stage of the M4’s ‘smart motorway’ upgrade.

Highways England is upgrading the motorway on the 32-mile stretch between junction 3 at Hayes and junction 12 at Theale and is preparing to start construction.

It has warned motorists to expect measures such as narrow lanes and reduced speed restrictions while work is carried out.

Noisier works will take place during the daytime, while there will be temporary carriageway and slip lane closures at night on some occasions.

Construction is being carried out in stages to minimise disruption, with the first phase starting at  junction 8/9 at Maidenhead in September before heading west to junction 10.

That phase is expected to finish in May 2020.

The more complex section for construction is going east from junction 8/9 towards junction 3, which will start in May 2019 and finish in December 2021.

There will also be work on four bridges between junctions 8/9 and junction 7.

The whole project is expected to be completed by spring 2022.

Highways England says that, as the main route between London and Wales, the M4 corridor carries an average of 130,000 vehicles a day making it prone to congestion.

Transforming the 32-mile stretch will involve converting the hard shoulder into a fourth lane for traffic and using more technology, including variable mandatory speed limits, to smooth flows.

There will be high visibility emergency areas to replace the hard shoulders, offering ‘places of relative safety’ every 1.12 miles on average.

The first drop in session will take at Holyport War Memorial Hall on Saturday, July 7 from 10am-1pm.

Sessions will also take place at Dorney Village Hall on Thursday, July 12 from 2pm-7pm and the Nicholsons Centre on Monday, July 16 from 2pm-7pm.

Go to to find out more.


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  • Pursuer

    15:03, 27 June 2018

    Years of diversions along overcrowded residential roads night after night. Miles of expensive plant & machinery parked on the hard shoulder & no sign of anyone working. Anyone wishing to question this ask people who live around the M3. I go to Camberley every month or so- you should see how the A30 has been worn out by diverted traffic.



  • Welshdragon

    15:03, 20 June 2018

    I wish the press would stop calling this an upgrade, its not. It a dangerous alternative to a full expansion.



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