Wind that blew trucks over was sped up by Auckland Harbour B

Coincidentally, scientists at the National Institute of Water and Atmospheric Research (NIWA) had been developing a computer model of wind patterns in the harbour as part of Team New Zealand's preparation for their defence of yachting trophy the America's Cup. 
They combined this 'Auckland Model' with a three-dimensional model of the bridge, looking at how air moves around it - and found the bridge itself causes the wind to speed up.
The modelling found speeds at road level and between the struts - one of which was damaged and had to be replaced - are 10 to 15 percent faster than the surrounding wind. While the modelling correctly identified the timing and direction of the gusts that September morning, it actually underestimated just how much faster the wind would get as it hit the bridge.

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