The New Zealand Transport Agency is warning motorists to expect delays on State Highway 25 just south of Coromandel township due to an underslip.

One lane of the road is currently closed and stop/go traffic management is in place following the slip below the highway which occurred at 4pm on Wednesday.

A geotechnical inspection of an underslip on State Highway 25 south of the Coromandel township will be taking place today. Photo: NZTA

The NZTA says the road is now closed to trucks and other heavy vehicles, which could cause more movement at the site. Heavy vehicles can use SH25A as an alternative route.

Geotechnical experts are assessing the site today and a further update will be issued following the inspection.

The location of the underslip which occured on State Highway 25 on Wednesday. Map: NZTA

For real time information on highway conditions and incidents or to report issues on the network visit www.nzta.govt.nz and click on ‘traffic and travel', call 0800 4 HIGHWAYS (0800 44 44 49) or by following the Transport Agency on Facebook or @nztawaibop on twitter.

Motorists can also go to www.drivelive.nz, a dedicated website that tells people what the current travel times are to get to key places around the North Island.

Photo: NZTA