A man who was fatally struck by a van while standing on the road mooning traffic was "the author of his own misfortune", a coroner says.

Shop worker Travis Jason Stephen Lane, 25, was hit by a Toyota van outside his home in Milton, New Zealand, about 8.35pm on February 22, last year.

He never regained consciousness and died on March 28.

Otago Southland coroner David Crerar found Mr Lane's death was the result of respiratory failure caused by a severe brain injury sustained when he was hit by the van.

In his findings, Mr Crerar said Mr Lane was significantly affected by alcohol and drugs when he repeatedly ran into traffic during a party at his home.