The NZ Transport Agency is reassuring motorists that engineers are closely monitoring two cracks which have appeared on a section of State Highway 5 (SH5) in Tumunui, south of Rotorua, and the road remains safe for travel.
The damage is on a stretch of highway near the intersection of SH5 and Highlands Loop Road. The road runs through a historic crater known as Earthquake Flat.
The cracks stretch across both lanes of the highway and are about 2cm wide.
The Transport Agency's Bay of Plenty highways manager, Niclas Johansson, said geotechnical investigations were underway to determine the cause of the damage and to work out the best response.
"These investigations will give us a better understanding of what we are dealing with and what the best solution will be going forward," he said.