The A303 is closed in both directions between the Hazelgrove Roundabout at Sparkford (A359) and the Podimore Roundabout (A372 / A37) following an accident. Diversions are in operation.
The man who died in a collision on the A303 last week has been named.
52 year old Paul Jewkes from North Somerset died after the car he was travelling in collided with a lorry on the A303 near Ilminster on Thursday 26th September.
Police are appealing for any motorists who were travelling along the A303 shortly after 11 o'clock that morning to get in touch.
The driver of the lorry has been arrested and released on bail on suspicion of dangerous driving.
The driver of a lorry involved in a multi-vehicle crash on the A303 in Ilminster on Thursday has been arrested in connection with the fatal collision.
One of the drivers in a multi-vehicle crash on the A303 in Ilminster in Somerset on Thursday has died.
Avon and Somerset Police said he was driving the Vauxhall Corsa.
The A303 in Ilminster is closed following a four-vehicle crash.
A flat bed truck travelling westbound was in a collision with a Vauxhall Corsa travelling in the opposite direction and then two further cars.
The male driver of the truck has been seriously injured.
A man who was in the Corsa also suffered serious injuries.
The road has been closed to enable a full examination of the scene.
This could take several hours and motorists are being urged to avoid the area.
Relief could be on the horizon for the millions of motorists who get caught up in traffic jams on the A303 into and out of the west country. The Government says it wants to improve the road - parts of which are only single-carriageway.
Today the Chief Secretary to the Treasury - Danny Alexander said a feasibility study would look into the possibility of dualing the A303.
Today the government said it would look at ways of improving the A303, parts of which are single carriageway. However, Chief Secretary to the Treasury Danny Alexander only announced a feasibility study - meaning any upgrade may still be some years off.
But a new £11 million bridge in Bristol is getting the go-ahead, as our political reporter Robert Murphy reports.
In announcing a multi-billion spending programme on major infrastructure projects across the country, Danny Alexander, the Chief Secretary to the Treasury, says money will be earmarked to widen the problematic A303, which runs from Wiltshire to Cornwall.
Any Honourable Member – from the Prime Minister down – who lives in Cornwall, or has driven there for their holidays, will want to see a better A303.