The A47 was partially blocked due to a car breaking down near Dereham.
Officers were called at 11.50am today (July 21).
A black Peugeot broke down just before the Drayton Hall Lane junction.
One lane was closed westbound and police remain at the scene.
There was heavy congestion building on the road following the incident.
Traffic backed up to the Yaxham Road junction.
The road had reopened by 1.30pm.
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