Justbefore 9am, Fire and Emergency New Zealand northern shift manager Paul Radden said the driver of the tanker was trapped but crews had "extricated him".
The highway was closed for a time between Thorpe Rd and Chestnut Rd, south of Atiamuri between Taupō and Tokoroa, but has since reopened with traffic management, according to the New Zealand Transport Agency Facebook page.
The latest post said traffic was being managed with a stop/go sign, and a detour was no longer required.
"Please allow extra time for delays in both directions until the scene can be fully cleared."
Diesel tanker rolled at Ohakuri. Photo / John Van De Ven
SH1 ATIAMURI - ROAD OPEN - FINAL UPDATE 3.00PM
State Highway 1 is now fully open between Atiamuri and Wairakei...