We used to call them a slip.

It is only blocking PART of the Northbound lane.

Definitely a slip and hardly newsworthy.

How many cones needed for the fix?

Herald link follows.

https://www.nzherald.co.nz/hawkes-bay-today/news/landslide-blocks-sh5-near-mohaka-bridge-delays-for-motorists/WXRBJDCJ6BDUZIVZGMOJJLNUTU/

PS – the accident at/near Tangoio (SH2) is very unlikely to affect traffic on SH5