The lat/lon position of the Airport in the Auckland TrafficConditions2 API is out, by quite a bit.
<tns:locations>
<tns:congestion>
Heavy
</tns:congestion>
<tns:direction>
Southbound
</tns:direction>
<tns:endlat>
-36.0016225672113
</tns:endlat>
<tns:endlon>
174.789329694473
</tns:endlon>
<tns:id>
63
</tns:id>
<tns:inout>
Out
</tns:inout>
<tns:name>
Montgomerie Rd - Airport
</tns:name>
<tns:order>
0
</tns:order>
<tns:startlat>
-36.98259
</tns:startlat>
<tns:startlon>
174.78429
</tns:startlon>
</tns:locations>
-36.0016225672113 174.789329694473 is somewhere well to the north of Auckland city, offshore.
This only affects Montogmerie Rd - Airport (id 63) and Airport - Montgomerie Rd (id 64). The location of Montgomerie Rd is correct in both.
Interestingly, the location of the airport is correct for Airport - Campana Rd (id 69) and Campana Rd - Airport (id 68).
The location was suspicious given how precise the coordinate is: all others are given to only five decimal places.
I've attached a screenshot from QGIS to demonstrate how far off it is.
