Police said there was no immediate suggestion that the circumstances were suspicious.
The driver of the vehicle has been taken to hospital following the smash on Monday.
Man in his 70s was airlifted to hospital with head and chest injuries.
The A72 in the Scottish Borders was locked down as emergency services responded to the incident.
A 26-year-old man died after a Ford crashed at Camperdown Park in Dundee.
The 47-year-old man was pronounced dead after being struck by the silver Seat Ibiza on Sunday.