A person has been flown to hospital in a critical condition following a serious crash on State Highway 2 at Tauherenikau in South Wairarapa.

Emergency services were called to the crash, involving a truck and a car, just before 12.40pm.

The injured person was initially trapped in a vehicle.

The Serious Crash Unit will examine the scene.

Diversions are in place and motorists are advised to avoid the area.