Underpass build begins: Traffic lanes on the move at Bayfair roundabout 1 Apr, 2021 07:00 PM 3 minutes to read New lanes will be constructed in the centre of the existing worksite so building the new underpass can get underway. Photo / Supplied New lanes will be constructed in the centre of the existing worksite so building the new underpass can get underway. Photo / Supplied Bay of Plenty Times By: Supplied content Significant changes to the road layout on State Highway 2 Maunganui Rd at the Bayfair roundabout are scheduled from next week. Waka Kotahi NZ Transport Agency infrastructure delivery regional manager Jo Wilton said with four of the five ground improvements sites completed the focus of the project was moving to the construction of the underpass and the Bayfair flyover.