A Northland Geotech expert says there'll be more landslides to fix if a new motorway is pushed further north from Auckland.
The Pūhoi to Warkworth highway opened only a month ago, but cracks have already appeared in concrete barriers with engineers working to stablise a big slip moving slowly towards it.
The motorway is supposed to be extended to Wellsford, but David Buxton from Northland Geotechnical Specialists says the land around that area is even more unstable.
Buxton spoke to Ingrid Hipkiss.
