An Invercargill man died after the car he was in veered off the road in rural Southland early Sunday morning.

Rodney Aaron Spiers, 40, died after the white 1988 Nissan Centra he was in swerved off Waikawa Valley Rd onto a grass verge and rolled into a deep culvert.

Police were called to the scene at about 3am.

Mr Spiers and another man were travelling north along Waikawa Valley Road near the Buckingham Road intersection when their car crashed.

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Mr Spiers died at the scene and the other man in the car escaped with minor injuries.

It is believed no other vehicles were involved, police said.

Police are investigating the cause of the crash, and would like to hear from anyone who saw the car before the crash.