A man competing in the Huntley Hillclimb was airlifted to hospital after crashing into a guard rail on Sunday.
Ambulance crews were called to the end of Avondale Road, Dapto, at 2.15pm.
When they arrived they found a 65-year-old man trapped in his car.
It is understood the man veered off the road and hit a guardrail while travelling about 60km/h.
The man suffered suspected spinal injuries and ambulance officers placed a cervical collar around his neck before removing him from the vehicle.
An ambulance rescue helicopter was called to the scene and the man was airlifted to Royal North Shore Hospital.
It was the second time on Sunday that a rescue helicopter was called to an accident on the South Coast.
Earlier in the afternoon, a man fell off his motorcycle at Kiama.
The 33-year-old was travelling along Jamberoo Road when the accident occurred, about 1km from the Riversdale Road turnoff.
He was treated at the scene for several fractured bones before being loaded into the NSW Ambulance rescue helicopter and flown to St George Hospital.