The alleged purpose of the flyover at the Basin Reserve is to introduce "grade separation" between traffic flowing westwards (from the Mt Victoria tunnel to Buckle Street) and traffic flowing north/south to Newtown and Island Bay. The effect is a flyover approximately 300 metres long, about 8-10 metres in the air. From inside the Basin Reserve, the flyover will be at about the same level as the Eastern Embankment, and completely visible from everywhere on the pitch and in the stands. While the final design has not been presented by the responsible agencies, it seems likely that it will dominate the Basin - visually, aurally, and because of the pollution that will be blowing across the spectator and playing areas in the prevailing northerly breeze.

Here's what the Council's own consultants had to say about the impact of a flyover on the sports ground:

The elevated structure for the grade separation of the Basin Reserve will be visually prominent and will affect the perception, symbolic character and context of the Basin Reserve and will impact on the overall character of the wider surroundings. The grade separation may also adversely affect the experience of those using the Basin Reserve.

These images have been prepared by the Save The Basin Reserve campaign based on the publicly available information - they are 3D renderings of the Basin Reserve flyover shown from above the playing ground. High-resolution JPEG and PDF versions are also available for download.