Police closed the A149 in Hunstanton after a teenager was knocked off his bike. (Image: Archant)
The East of England Air Ambulance and specialist critical care medics were called to treat the patient, who has been taken to the Queen Elizabeth Hospital in King's Lynn.
The cyclist suffered head injuries and was drifting in and out of consciousness in the collision with a vehicle in area around Lynn Road and Sandringham Road. It happened at around 8.45am.
Police were called to handle traffic control while medics attended to the patient.
An ambulance spokesman said: 'The air ambulance staff also accompanied the ambulance staff to offer any extra care or support for the patient.'
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