The A35 was partially blocked after an accident between a tractor and a car caused a fuel spill at Puddletown.
There was slow traffic and the northbound road was partially blocked before the B3142 Druce lane and A354 Blandford turn off.
Police received reports at 9.12am of a two vehicle collision.
No one was injured but drivers were warned to approach with care as there is a fuel spill on the road.
The accident was reported to have happened on the corner of the B3142, just before the roundabout close to Long Lane.
Police said local authorities were at the scene dealing with the spill.
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