Motorists are facing rush hour traffic chaos on the A47.
A broken down vehicle is blocking the road between Honingham and Hockering.
Traffic is queued back for about five miles in each direction.
Police were called to the scene at about 4.30pm on Tuesday.
Motorists are advised to avoid the area while officers deal with the vehicle.
It follows earlier disruptions on the A47 after another vehicle broke down near Heathersett's Thickthorn roundabout.
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