A "large amount" of tyre debris across the carriageway has caused part of the A11 to close.
The A11 is closed northbound between the B1077 junction near Besthorpe due to tyre debris on the road.
Norfolk Police are in attendance and are working to clear the carriageway.
Delays are expected as traffic is being diverted via local routes.
Highways England said: “Please allow extra time for your journey if you're travelling in the area this afternoon.”
For up-to-date information about the county's roads, visit our LIVE Norfolk traffic map.
Join our Norfolk Travel Information group on Facebook for all the latest traffic news in Norfolk.
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 The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.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