A 27-year-old man is in a serious condition after falling off the back of a four-wheel-drive utility at Campbell Town early Sunday morning.
Emergency services were called to the scene on High Street about 12.10am, near the intersection of Bridge Street.
The man sustained serious head injuries after falling from the vehicle, police say.
He was transported to the Launceston General Hospital.
The vehicle and driver involved have not yet been identified.
Police are investigating the matter and are seeking witnesses.
Anyone with information is asked to contact Tasmania Police or Crimestoppers on 1800 333 888.