The drivers of a car and lorry are now being treated by paramedics at the scene for minor injuries, police said.
The slip road has been shut to all traffic at the Eastleigh north junction joining the southbound carriageway to allow for emergency services to recover the vehicles and examine the area.
Police said the lorry driver had suffered a leg injury while the injuries to the driver of the car, a red Peugeot 206, were unknown but thought not to be serious.
They added that the Peugeot appears to have been forced up the embankment and came to rest facing oncoming traffic, being held up by the trees.
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