A man in his 40s from Hertfordshire has been arrested following a crash on the A47 at Thickthorn, near Norwich.
A cyclist was left in the road with serious injuries following the collision on February 9.
Police believe he was cycling along the A47 between Thickthorn and the A140 junction. They were called at 5.30 am to reports of the cyclist in the road.
The lorry left the scene and has since been traced by police.
Any witnesses are asked to contact the police on 101.