Video footage has emerged claimed to be from a boy racer gathering on State Highway 2 north of Napier.
The 100-car gathering on a section of State Highway 2 caused "significant damage" to the highway and has already led to four arrests.
The gathering, labelled "anti-social" and "dangerous" by police, occurred on October 16, near Tangoio, north of Napier.
The video shows a police car travelling slowly on the highway, and someone yells out "let it through".
Cars are shown doing burnouts, down to the rims of tyres.