A two-vehicle crash has partially blocked the A34 southbound and is causing slight delays.
The crash happened at about 10.45am and emergency services are still on the scene and four people are being checked over.
South Central Ambulance Service spokeswoman Michelle Archer said: "We were called to the A34 near Drayton to a two vehicle road traffic collision.
"We have an ambulance at the scene assessing four patients."
Reports show traffic is easing.
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