Police confirmed the death about 6.30pm yesterday.
The highway was closed at Omakau and the Ida Valley turn-off with diversions in place. The road reopened at 9.20pm.
Fire and Emergency services southern shift manager Mau Barbara said fire crews were dispatched from Omakau, Alexandra and Ranfurly.
Meanwhile,emergency services were also called to a two-vehicle crash about 6.15pm on Naseby-Kyeburn Diggings Rd, north of Naseby, on Saturday night.
A St John spokeswoman said four people were injured in the crash - three patients were taken by helicopter to Dunedin Hospital, two in a serious condition, one moderate, and one person was treated at the scene for minor injuries.