Jen Mills
Published November 30, 2025 10:05am
Updated November 30, 2025 10:41am
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The scene of the crash near Leigh Delamere Services (Picture: Daniel Jae Webb/State Six News)
Part of the M4 motorway is expected to be closed all day after an accident in the early hours of this morning.
A black Mercedes car left the eastbound carriageway near Leigh Delamere Services at around 2am, meaning the road had to be shut between Junction 18 (Bath) and Junction 17 (Chippenham).
National Highways did not give an exact time when traffic would return to normal, but said they expected disruption to continue into the afternoon.
The crash happened on the slip-road to Leigh Delamere services (Picture: Daniel Jae Webb/State Six News)
A spokesperson for National Highways said: ‘At around 2am Wiltshire Police responded to a serious single vehicle collision involving a car which left the eastbound carriageway near Leigh Delamere services.
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‘The carriageway was closed to allow Wiltshire Police, Dorset and Wiltshire Fire and Rescue Service and South West Ambulance Service to work at the scene of the collision.
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‘National Highways Traffic Officers attended the scene and assisted the emergency services by providing traffic management at both the scene and at J18.
The section of the M4 eastbound closed after the single vehicle crash (Picture: Google Maps)
‘All traffic caught within the closure was turned and released via rearward relief.
‘Although no definite timeframe can be given for re-opening at this stage, early indication suggest the closure will remain in place throughout this morning and into the afternoon.’
Diversion route today
National Highways said road users are advised to follow the Solid Square diversion symbol on road signs.
- At Bumpers Farm Roundabout take the 1st exit onto the A350 northbound towards the M4/Cirencester and continue on the A350 until you reach J17 of the M4
- Leave the M4 at J18 and take the 3rd exit onto the A46 south towards Bath.
- Follow the A46 for approximately 3 miles to the roundabout with the A420 at Cold Ashton and take the 1st exit onto the A420 east towards Chippenham.
- Remain on the A420 for approximately 10 miles to reach the Bumpers Farm Roundabout with the A350
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