The road was closed for three-and-a-half hours to allow officers to carry out investigations at the scene. Officers would like to hear from anyone who witnessed the collision or saw the motorcyclist prior to it.
Anyone with any information should contact Totton Roads Policing Unit, quoting Operation Froggen, on 101, or the Crimestoppers charity anonymously on 101.
More top news
Sunday's weather update for the east with Philippa
Sunday's weather update for the west with Philippa
A woman from Farnham who almost died from meningitis is welcoming news that ALL babies will be given vaccine