From Devon & Cornwall Police:
Police were called at 8.30pm on Tuesday 10 September to the B3183 Clyst Honiton bypass, following reports of a serious injury collision.
It was reported that the collision involved a 16-year-old pedestrian and a car.
The male victim, was treated at the scene before being taken to RD&E hospital. His injuries remain serious at this time.
The car fled the scene following the incident and was located following searches.
A 28-year-old man, from Exeter, was arrested on suspicion of dangerous driving, disqualified driving, driving whilst unfit through drink or drugs and failing to stop. He remains in police custody at this time.
A stretch of the B3184 bypass that runs underneath Exeter Airport remained closed while a forensic examination of the scene was conducted. The road was fully reopened at 1 am.
Officers from the Exeter Roads Policing Unit are appealing for witnesses to come forward.
Anyone who witnessed the incident and anyone with information is asked to contact police on 101 quoting log number 0853 of 10/09/19.