Traffic was switched onto the new Paengaroa roundabout last week, as part of the Tauranga Eastern Link project.
The New Zealand Transport Agency said drivers travelling along State Highway 2 and State Highway 33 would have welcomed the improvement to their journey.
Although not completely finished, the agency said it was a huge milestone for the Tauranga Eastern Link project and delivered immediate safety benefits to the region.
The new roundabout replaces the old SH2/ SH33 T-intersection, which had been identified as a high-risk intersection.
NZ Transport Agency acting Bay of Plenty highway manager Andrew Scott said the agency was thrilled to be able to improve safety for drivers in the region by putting the new Paengaroa roundabout into use ahead of the TEL opening next year.