Most of the crashes were caused by vehicles turning right, cars travelling too fast and poor visibility, Waka Kotahi said.
From Monday, traffic lights will be operating at the intersection 24 hours a day, and the Waka Kotahi will be monitoring delays and queues.
The layout was expected be in place for four months, weather and ground conditions permitting.
Those traveling in light vehicles on SH33 can use Hamurana Road/SH36/SH5 to bypass the worksite, or use SH36 to/from Tauranga.
There is no detour for heavy vehicles or those travelling to/from SH30 east.
Drivers were advised to take care as they adjust to the new road layout. Follow the speed limit, share the road safely and be aware of traffic in and out of Rangiteaorere Rd and local driveways, Waka Kotahi said.