A lane of the A11 is closed to traffic heading into Norwich following a crash during rush hour traffic.
Police are on the scene near the Thickthorn Interchange following a crash earlier on Friday evening.
A spokesman for Norfolk Constabulary wrote on Twitter that one lane of the northbound carriageway had been closed as a result of the incident.
Police have urged people to avoid the area, seek alternative routes and expect delays while traffic officers tend to the scene.
The incident has led to a heavy tailback of traffic between Wymondham and Thickthorn in the Norwich-bound carriageway.
No further details have been made available at this time.
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