A motorcyclist who hit a parked car on the Whangaparaoa Peninsula early today is now in a stable condition in Auckland City Hospital's intensive care unit.

Police were alerted to the crash on Whangaparaoa Rd at 4am.

A St John Ambulance spokesman said the motorcyclist, a man in his 20s, was trapped underneath the car.

"Two ambulances were sent and he was airlifted to Auckland City Hospital in a critical condition."

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An Auckland District Health Board spokeswoman said the man was still in the intensive care unit at 9.30am today but was now in a stable condition.

Police said the Serious Crash Unit had been advised and was investigating.