A person has died after two trucks crashed near Christchurch this morning.

Emergency services were called to the crash on Main South Rd in Templeton at 7.30am.

A police spokeswoman told the Herald the crash was a nose-to-tail.

Acting Inspector Paul Reeves said the road is expected to be closed for several hours and traffic is being diverted.

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The commercial vehicle investigation unit and the serious crash unit are investigating.

Christchurch Transport Operations Centre advisor Steven Mann said State Highway 1 near Templeton would be closed for about three hours.

"The detour route is via Jones Rd which is under stop/go control."

He said traffic congestion is heavy in the area, and motorists "need to be patient and take extra care".