Police are appealing for witnesses following a collision on the A143 at Earsham near Bungay.
It happened on Saturday just before 11pm on the Old Railway Road at the junction with Hall Road.
A multi-coloured Honda motorcycle and a white Kia Picanto were involved in the collision, and the motorcyclist suffered serious injuries.
Police are keen to hear from anyone who witnessed the incident or has information about the way either vehicles were being driven beforehand.
Witnesses should contact PC Richard Syrett at Wymondham Roads Policing on 101.
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