The A47 was partially blocked after a crash between a car and a lorry at Postwick, outside Norwich.
The crash happened at about 2.30pm, close to the A146 junction.
Norfolk police said no injuries were reported.
There was heavy congestion and slow traffic westbound between the A1042 Yarmouth Road and Trowse Newton and drivers were urged to avoid the area.
Police said the vehicles were recovered by 4pm and traffic was moving freely again.
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