A 21-year-old man critically injured in a Southland crash on Wednesday has died in hospital.

The man was riding a motorbike on a gravel road in Wallacetown, 15 minutes from Invercargill, when when crash happened just before midday.

He was transferred to Southland Hospital's intensive care unit with critical head injuries, but died yesterday.

The truck was travelling south along Dunlop Rd, carrying rocks. It had stopped in a dip and was apparently about to negotiate a left-hand bend.

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The Police serious crash unit is investigating.