A man in his 40s, from Hertfordshire, has been arrested in connection with a collision this morning (Friday February 9) which left a cyclist with serious injuries.
The arrested man is due to be questioned by officers later today.
Police are still appealing for witnesses to the smash, on the A47 at Thickthorn.
Officers were called at 5.30am to reports of a male lying in the road. Further enquiries established he had been cycling along the eastbound carriageway between the Thickthorn and A140 junctions when he was in collision with a lorry.
The lorry left the scene following the incident, travelling in the direction of Great Yarmouth.
The cyclist was taken to the Norfolk and Norwich University Hospital with serious injuries.
The road was closed while officers dealt with the incident but has since reopened.
Anyone with information or dashcam footage should contact PC Andrew Lincoln at Wymondham Roads Policing on 101.