Motorists faced long delays as a four car crash causing queues from Dorchester to Weymouth.
The collision occured in the area of the Dorchester Football Ground roundabout, near the junction of Weymouth Road and the A35, and there are delays on all approaches to the Football Ground roundabout.
A spokesman for Dorset Police said: "We were advised about the collision by an off-duty police officer at 6:02pm.
"It is a temporary obstruction of the carriageway.
"The collision is not serious, and there is no suggestion of injuries."
The vehicles are now off the road and are all awaiting recovery.
Traffic is heavily affected.
#TravelDorsetAlert: Dorchester - very long delays on all approaches to Football Ground Roundabout due to a collision.
— Travel Dorset (@TravelDorset) July 20, 2017
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