Avon and Somerset Police have issued an appeal for witnesses following a serious road traffic collision near Bath.
They were called to the collision between a taxi and a pedestrian on the A367 Junction with the B3115 between Bath and Peasedown St John at 2.50am.
A 19-year-old man with serious head injuries was taken to hospital.
Police are appealing for witnesses who may have been in the area at the time of the incident.
Anyone able to help is asked to call the police on 101.