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A man is dead after he was hit by a truck as he tried to run across Auckland's southern motorway soon after daylight today.

The accident closed southbound lanes of the motorway at Ellerslie, south of the city and caused traffic congestion all morning.

Police said it had caused delays and advised motorists to avoid the area.

All lanes were declared open at 12.45pm.

The police Serious Crash Unit was investigating the accident.