UPDATE: Trenowah Road has now reopened following the earlier collision.
The male motorcyclist was treated for minor knee injuries at the scene before being transported to Treliske Hospital in Truro by land ambulance.
His injuries are not life changing or threatening.
EARLIER: A motorcyclist has been injured following a collision with a car at St Austell.
Paramedics have been called to the scene to treat the injured male rider.
The motorcycle collided with a Seat Leon at around 4.45pm on Trenowah Road and traffic is said to be blocked in both directions.