Well now you see there is no consensus. No authority can make up it's mind either. However, I don't believe council can pass any local laws in contradiction to NZ law, except council also has permission to set bylaws (so things like alcohol free areas spring to mind).
Motorway bus lanes are a totally different beast to everything else and while some cops seem to have said that yes, you can use those, I don't think you legally can (some areas are simply the hard shoulder). Then again, it's like anything, if a cop thinks you've broken the law they can fine you, even if they're wrong. Then you have to defend it and prove them wrong. Of course, all this takes up your time, you have to take time off work blah blah blah oh look, I have better things to do than be the test case. Likely you'll go up against a Justice of the Peace (or two) which I have no respect for, you'd likely lose and have to take it to district court to get it overturned (JPs take the police side the vast majority of the time even against evidence).
Basically, for those "bus only may proceed from left lane" I wouldn't be using them. Not from a legal perspective, but from a safety one. Cars will not be expecting a motorcycle there, you're not the size of a bus (cars don't see trains OK?) so why you'd increase the risk I don't know... The specific ones like Gossamer are not bus lanes, so bus lane law may not apply (I haven't read the legislation). Ti Rakau/Springs and Ti Rakau/Pakuranga Rd are a bus lanes, controlled with additional light etc.
Ultimately, it doesn't matter what an authority website says. If legislation allows it, then the authority doesn't have a leg to stand on if it says something contradictory. Again, you get to argue that (and lawyers get paid a lot of money to argue these very points, intent, purpose etc).
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