Hi Steve, well lets say no one has told me not to yet.
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It comes down to what the bikes are imported as and because mine was purpose built to be a traffic patrol bike it gets to stay that way.
My son is a Police Officer and he gave me the bike (in bits) and he cannot find any legislation that forbids it, I also know of a CB360P in the next city which is all lights and sirens too and he has never had any trouble with the law, in fact he thinks they like the extra coverage ha ha.
I'm seriously thinking of getting the number plate "DECOY" fitted as everyone around here thinks mine is the local Police patrol bike (which is actually a BMW) but it certainly has the deterant effect.
Not that I can be charged with impersonating an officer as I am a Corrections Officer anyway ha ha and our training is fairly similar to our Police.
I know a guy in the South Island who had special vinal covers made for his lights, they look exactly the same as his lights when fitted so no one can complain...but tehy are a bit more anal about those things down south.