Drivers were stuck in "standstill" traffic after a crash on the A11.
The incident happened on the northbound side of the major road at Ketteringham just after 8am.
Ambulance, fire crews, and police were all at the scene.
Part of the A11 from Wymondham, towards Norwich, was closed.
A spokeswoman for Norfolk Constabulary said two vehicles were involved and one of the vehicles was a van.
The extent of injuries is unclear but the East of England Ambulance Service has been contacted.
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