A crash between a van and a tractor on the A47 Norwich bypass is causing queues for rush hour traffic.
Police said no-one was injured in the collision which happened just before 5.45pm between the A140 and A146 junctions.
It is affecting the eastbound carriageway.
A police spokesman said the road was still open but was likely to have queues because of the volume of traffic using the road.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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