The first slip on the 19 October saw approximately 10,000cu m of material came down on to the road. This latest slip, which came down in the early hours of yesterday morning following heavy rain, was much smaller.
"This is an active site and there's ongoing risk due to the instability of the cliffs. This latest slip was 200cu m in size and came from the upper left side of the face that had already come down 13 days ago," Brady said.
"Geotechnical engineers advise that more material is likely to slip again at this location should the area get more heavy rain.
"To ensure the ongoing safety of road users we are closing the shoulder closest to the cliff and installing a temporary speed limit of 50km/h past this site. Temporary caution signs will stay in place while we investigate installing permanent rockfall signage along this stretch of highway.
"We will also employ arborists to advise whether any overhanging trees need to be removed to shore up the cliff face.
"In addition we will continue to monitor the area with drive-by patrols twice a day, which we'll increase to two-hourly if there is heavy rain in the area," Brady said.
The region has experienced significant rainfall, coastal surges and strong winds this year, all of which put pressure on a roading network that is already susceptible to unstable geology.
"Many Aotearoa New Zealand highways face similar risks due to the threat of climate change. Coastal erosion and frequent and prolonged extreme weather events are proving a big challenge for the whole country," Brady said.
"The best advice we can give drivers is to be vigilant and drive to the conditions. Be aware that road hazards are a potential at any time.
"Both Waka Kotahi and our contractors would like to extend our thanks to road users, who have been detoured via Ōpōtiki District Council roads. We appreciate you tolerating a temporary speed limit here now.
"Your safety is our primary concern."
