Police advised the public to avoid State Highway 2, near Te Hauke, following a large tangi for a senior Mongrel Mob member.
Hundreds of gang members joined the procession on Tuesday afternoon after a service was held at Te Kura Kaupapa Maori o Ngati Kahungunu ki Heretaunga.
Police said there was congestion on SH2 due to a large gang tangi taking place south of Pakipaki.
"Police are monitoring the tangi, and we are managing traffic to ensure everyone using the roads is safe," a spokeswoman said.