There has been a serious accident between Andover and Salisbury on the A343 road.
The road between Middle Wallop and Lopcombe Corner has been closed.
Witnesses said the area was completely congested with cars turning around.
An onlooker said: "I was told by a lorry driver the road would be shut for two hours at least."
Hampshire Police has been contacted for comment.
Updates as we get them.
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