A man has been taken to Nelson Hospital in a critical condition following a crash south of Nelson.

Police were called to the crash around 3.30pm today, which happened on Stock Rd in Golden Downs.

A heavy truck left the road and crashed into a tree, and a man was trapped in the vehicle for a time.

Emergency services cut the man free and he was taken to hospital.

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Police said the other occupant was not injured.

The Serious Crash Unit is investigating and traffic control is in place in the area.