State Highway 2 remains closed just south of Dannevirke after a truck and trailer unit rolled last night.
The accident on the Manawatu highway happened about 10.15pm, but the road was still blocked at 6am today, Sergeant Andy Dow of police communications said.
Detours were in place to keep traffic moving between Woodville and Dannevirke while a crane was used to get the truck and trailer unit back on its wheels, Dow said.
Meanwhile in the north, SH1 south of Whangarei is closed this morning due to a crash, the New Zealand Transport Agency says.
The northbound road was closed at 7am between Loop Road South and Loop Road North near Otaika.
The road was expected to close in both directions shortly so the vehicles can be recovered.