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
A farmer has welcomed a herd of alpacas to his farm this Christmas to protect his flock of 24,000 free-range turkeys from fox attacks.
Paloma Faith has praised the NHS after undergoing an emergency caesarean section during the birth of her first child.
As ITV News reports on the environmental impact of over packaging, we ask you to share your pictures of retailers' overzealous packing.