A man has died after a vehicle crash in Hawke's Bay overnight.

Emergency services were called to a crash on Mangapapa Bridge on State Highway 38 near Frasertown overnight.

Police said one vehicle with a sole occupant was found, a 23-year-old from Wairoa. He was found dead at the scene.

Police said indications are that the vehicle may have hit part of the bridge. The cause of the crash is being examined by the serious crash unit.