A man has died in hospital one day after being found on the side of a Gold Coast road with serious head injuries after a suspected hit-and-run accident.

Police say the the 77-year-old was found after a “traffic incident” by a passer-by on the side of the Gold Coast Highway at Miami at 3.35am on Tuesday.

He had serious injuries and was rushed to Gold Coast University Hospital, where he died of his injuries on Wednesday.

Police are questioning a 34-year-old man from Southport in relation to the incident and have seized his car as evidence.

The police forensic crash unit is investigating and have appealed for any witnesses or people with dashcam to come forward.

-AAP