A truck and trailer rolled in Waikato overnight but the driver was not injured.
Emergency services were called to State Highway 4, between Te Kuiti and Taumarunui, at 4.20am.
One lane is blocked but traffic is still able to pass and a traffic management team is at the scene controlling traffic.
A heavy haulage vehicle is on the way to assist with removing the rolled truck.
Motorists are advised to take extreme care around the crash scene.