Hampshire Police said a man in his 20s was arrested at the scene of the crash on suspicion of causing death by driving without due care and attention.
The double-crewed ambulance belonged to South Central Ambulance Service NHS Foundation Trust (SCAS) and was en route to Southampton General Hospital with the elderly patient.
More top news
Emmerdale fans were left wondering if half the cast had been killed off after Thursday's catastrophic crash episode.
Given that the unanimous vote by MPs today was not binding, what are the chances of Sir Philip Green being stripped of his knighthood?
Tomorrow will be dry at large with spells of sunshine for most areas.