The A47 was blocked on the outskirts of Norwich due to a broken down vehicle and caravan.
Officers were called at 12.06pm following reports of an obstruction on the road near Harford Bridges.
The vehicle was Great Yarmouth bound when it broke down.
The road was gridlocked and drivers were urged to avoid the area.
There was heavy congestion stretching from the Harford Bridges junction to the Trowse junction.
The road was cleared and reopened by 1.36pm.
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