A man was taken to hospital with serious injuries after his car left the A11 and rolled into a tree.
Police, fire, ambulance and air ambulance crews were called to the major road at Larling just before 2.30pm on Tuesday.
They had received reports of a silver Honda Accord leaving the road, rolling and colliding with a tree as it travelled northbound.
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The driver, a man in his 20s, was taken to the Norfolk and Norwich University Hospital with serious injuries.
He was the only person in the car at the time of the crash and the road was closed until around 8.30pm.
Police are now appealing for witnesses.
Anyone with dashcam footage of the collision or the manner of driving prior is asked to get in touch by calling 101 or emailing sciu@norfolk.police.uk and quoting reference 279 of July 30.
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