Police said the driver of the vehicle is from Central Otago.
"She is being supported by friends and by Victim Support," police said.
Police have spoken to a number of witnesses and examined the crash scene. which has helped clarify what occurred.
Police confirmed speed and alcohol are not believed to be factors in this crash, however investigations are continuing.
Last night, police initially said the man was being airlifted to hospital by rescue helicopter in a critical condition, but a short time later they advised he had died.
The highway was closed between Alexandra and Clyde and diversions were in place through Airport Rd, Dunstan Rd and Springvale Rd following the incident.
Alexandra Police are still keen to hear from anyone else who may have information about the crash, on (03) 440 2500.
Additional reporting from Otago Daily Times.