The A35 westbound is closed near Dorchester after a three vehicle crash.
Emergency services were called just before 10am to the crash which occurred between A352 (West Stafford turn off) and B3150 Stinsford Hill (Stinsford roundabout) at Dorchester.
The crash involved a white Renault Megane, a black Skoda Superb and a white Mercedes van.
No one was injured.
The west-bound carriageway has been closed and police are directing traffic.
East-bound traffic is also affected and there is congestion up to the A354 Blandford Forum turn off near Puddletown.
More to follow.
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