New Zealand Transport Agency Waka Kotahi said due to the crash near McFall Rd, southbound traffic was being diverted via Ryburn Rd.
Northbound traffic remained on SH3 but people should expect delays.
The detour route for southbound traffic was turning right to Ryburn Rd, left to Meadway Rd, continuing on to Paterangi Rd to Alexandra St in Te Awamutu.
A Fire and Emergency New Zealand spokesperson said two trucks from Te Awamutu attended, providing assistance to ambulance and police.
Danielle Zollickhofer is a multimedia journalist and assistant news director at the Waikato Herald. She joined NZME in 2021 and is based in Hamilton.