The A354 near Dorchester was partially blocked earlier due to a crash.
It happened in the area of Winterborne Monkton about 11.30am.
There were reports of very slow traffic between the A35 (Football Ground Roundabout) and back down the relief road towards Weymouth.
The route was cleared about 1pm but traffic remained slow for a while.
It is not known if anyone was injured.
Dorset Police have not responded to a request for comment.
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