The A35 was blocked in both directions near Bere Regis after a vehicle fire involving a car towing a caravan.
Police were called shortly after 12pm.
The road was blocked between the Shell roundabout at Bere Regis and the B3075 Chiltern Hill junction East Morden.
No-one has been injured in the incident but the caravan has been totally destroyed by the fire.
Police and fire crews were at the scene. The road has since been reopened.
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