The almost 100-year-old timber overbridge spanning the main trunk railway line at Kōpaki on State Highway 30 had reached the end of its life and needed replacement.
A new bridge was built alongside the old one, allowing the road to remain open throughout the two years of construction.
The intersection between Kōpaki Road and SH30 is being moved further away from the bridge to allow for better visibility for turning traffic.
With the new bridge complete, trucks are no longer required to detour using SH3, SH4 and Kōpaki Road.
With the completion of the new bridge, the old bridge will be removed.