The New Zealand Transport Agency has shared a time-lapse video showing a "hive of activity" at the Maungatapu underpass construction site.

The project, which started in mid-September, is constructing an underpass on State Highway 29A underneath the Maungatapu roundabout.

Along with the underpass, the project includes new cycle links and a cycle and pedestrian bridge above SH29A.

The video shows activities at the site over December 2015.

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The Transport Agency's Bay of Plenty highway manager, Niclas Johansson says the underpass will separate state highway and local traffic, reducing congestion at peak times and making travel safer for pedestrians and cyclists.