Emergency services were called to reports that a pedestrian had been hit by a car in Thetford on Tuesday.
The East of England Ambulance Service were called to the incident in Hurth Way, Thetford, at 6.08pm.
An ambulance, a response car and an air ambulance were sent to the scene, where a young woman was found in a serious but not life-threatening condition.
She was taken by land ambulance to West Suffolk Hospital, in Bury St Edmunds.
A police spokeswoman said they were called at around 6.17pm following reports that a black Vauxhall Astra had been involved in a collision with a pedestrian.
Norwich Road was closed from the roundabout to the junction with Hurth Way to allow the air ambulance to land.
The road blocks were lifted at around 10.25pm.