The police staff, four male inmates and a female inmate were checked out at the scene by ambulance staff.
"None of them were injured," the spokesman said.
The occupants were transported back to Gisborne in another van.
Police have issued a warning to motorists about the icy conditions in the Whareratas.
"The responding emergency vehicles this morning also encountered very icy conditions on the Wharerata road," police said.
In another icy road-affected incident, a freight truck went off the road near Otoki Orchard on State Highway 2 at Whakaki.
That incident happened at about 6.35am.
The truck ended up in a roadside drain but stayed on its wheels.
The driver was not injured.
- Gisborne Herald