Traffic is reportedly 'at a standstill' on the A35 between Bridport and Dorchester.
It is thought to be queues connected to holiday traffic - people heading to the coast or attractions, or travellers heading home after the Easter weekend - rather than any particular road incident.
As well as queues on the A35 between Bridport and Dorchester there are also reports of delays in Bridport itself and on the bypass and on the Dorchester bypass.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here