A man has died after a crash in Mid Canterbury this morning.

Police said he was killed after his car crashed into a power pole on State Highway 77 - also known as the Methven Highway - between Methven and Ashburton shortly after 3.30am.

The crash happened on the highway near Ashburton.

The man was the sole occupant of the car.

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The Serious Crash Unit is investigating.

The NZTA said SH77 was closed between Thompsons Track and Blands Rd.

A detour is in place and motorists travelling between Methven and Ashburton are being advised to plan ahead.