State Highway 29 over the Kaimais has reopened after being closed due to risk of rock fall from the Ruahihi Bluffs earlier today.
The New Zealand Transport Authority (NZTA) is advising motorists the highway is now open to one lane.
Bay of Plenty state highway manager Brett Gliddon said an earth bund has been put in place to protect road users and prevent further rock falls.
"Contractors have worked hard to clear unstable rocks and get the road open as quickly as possible."
A 30 kilometres per hour speed limit is in place around the area.
Heavy rain overnight caused rocks on the Ruahihi Bluffs to pose a potential risk to motorists.
Gliddon said the NZTA would closely monitor the situation overnight with heavy rain expected to last the next few days.
"If drivers must travel we urge that they take extreme care on the highways, drive to the conditions, and allow more time so they can reach their destination safely."
Contractors will reassess the bluffs tomorrow to decide if more rocks need to be removed.