The cache is not at the posted co-ordinates.
Welcome to what we have affectionately termed Bapgirl's Bridge, as this bridge is, at the time of placement, part of Bapgirl's regular commute. The idea of perceived personal ownership of public property started (in my family at least) with a bridge in Palmerston North which my mother claimed, so we're continuing the tradition here.
Bapgirl's Bridge has some great views at both daytime and nighttime, and this multi will have you observing these exact views.
The final is located at S 36° 47.ABC E 174° 45.DEF, where:
A = The number of road lanes which pass under the bridge
B = The number of emergency call points along the bridge
C = The sum of the digits of the height of the overpass to the south
D = The number of painted chevrons on the motorway on the northern side of the bridge from the Akoranga Drive northbound onramp (this one might be a bit tricky if you're vertically challenged, you may need to utilise some creative angles)
E = The sum of the sixth and ninth digits in the lift's emergency phone number
F = The number of bike stands at the eastern end of the bridge
You can validate your puzzle solution with
certitude.
If you look really really reaaaaallllly closely, you could probably see the cache from Bapgirl's Bridge... but you'd need quite the pair of binoculars for that.
Once you've solved the puzzle, I recommend walking to GZ, as parking in the area is limited.