M4 to shut as major repair works begin within days

Commuters are warned that they could face delays as a 50mph speed limit is introduced until February. <i>(Image: National Highways)</i>
Commuters are warned that they could face delays as a 50mph speed limit is introduced until February. (Image: National Highways)
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M4 is set to close overnight this week for essential improvement works.

A westbound section of the M4 in Wiltshire, between junctions 16 and 17, will shut on the night of Thursday, November 12, as part of a £20 million National Highways scheme.

The work will also result in the introduction of a contraflow system and a 50mph speed limit along a stretch on the M4,  as well as the closure of lane one and the hard shoulder.

Eastbound lanes will continue to run as normal, however the 50mph speed limit is expected to be in place until February of next year.

Chris Hilldrup, route manager for National Highways, said: "Many of the roads and bridges we manage were built around 60 years ago and are nearing the end of their life span, so we're acting now and renewing them to prevent bigger problems further down the line.

"This £20m investment along the M4 in Wiltshire is a significant engineering undertaking.

"Once we have stabilised the embankment, we will refurbish the bridges and upgrade barriers to maintain the safety and reliability of this busy route for many years to come."

The project began on October 5 and is expected to continue until February next year.

During the overnight closure, westbound traffic will be diverted through Royal Wootton Bassett using the A3102, which may lead to congestion through the town. 

Traffic will then join the A4 to Chippenham, before taking the A350 and re-joining the M4 via the junction 17 roundabout.

Heavy goods vehicles will follow a separate diversion via Cirencester and Malmesbury.

The repairs address damage caused by a landslide earlier this year, which left part of the eastbound hard shoulder unusable.

Contractors MJ Church will remove around 25,000 tonnes of earth and replace it with 19,500 tonnes of stone sourced from a nearby quarry.

This must be completed before scheduled bridge refurbishments begin in autumn 2027.

The wider £20 million project also includes refurbishing four bridges and upgrading 1.3 miles of safety barriers, as well as improvements to drainage along the M4.

The bridges being upgraded include those at Brinkworth, Grittenham, the Swindon to Bristol railway line and a nearby farm access road.

Train services are expected to run as normal during the works.

National Highways has warned that closure dates and times may change at short notice, and urges drivers to allow for extra time and expect minor delays, especially during peak times.

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