A person has died after an overnight crash between a truck and a motorcycle in south Canterbury.

The motorcyclist was in a critical condition when emergency services arrived at the crash, on Selwyn Rd, near Robinsons Rd, Rolleston about 3.30am.

Despite medical efforts, he died a short time later.

The Serious Crash Unit and the Commercial Vehicle Safety Team are investigating and the road is closed.

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Police ask that motorists are patient if they experience delays.