A man has died in a car crash on the M4 in the early hours of this morning, with part of the motorway expected to be closed all day.
The man, aged 32, was travelling in a black Mercedes which came off the road on the slip-road to Leigh Delamere services at around 2am on Sunday morning.
Another man who was in the car is in hospital with serious injuries.
The M4 eastbound is 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.
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Wiltshire Police said: ‘The man’s next of kin have been informed and they are receiving support from specially trained officers. Our thoughts are with them.’
They apealed for any witnesses, or anyone with dash cam footage, to contact them.
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.
‘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.
‘National Highways Traffic Officers attended the scene and assisted the emergency services by providing traffic management at both the scene and at J18.
‘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.’
National Highways said road users are advised to follow the Solid Square diversion symbol on road signs.
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