Officers are appealing for information after two vans crashed in Trowse.
The white Ford Transit and a white VW Transporter collided on the A146 Trowse bypass close to the A47 slip road last Wednesday.
The transit had been travelling down the slip road and the transporter along the A146 towards Norwich.
Three people were slightly injured in the accident, which happened shortly before 10.30pm on Wednesday, May 7.
Nobody was taken to hospital.
Police said they want to hear from anyone who may have seen the collision, or either vehicle beforehand.
Witnesses are asked to contact PC Steve Turner at Norfolk Constabulary on 101.
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