States have the legal right to introduce their own rules, over riding ADRs if they desire.
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But it would have to be legislation through parliament and these aren't. If the police want to put a sticker on your car it has to be for breaching legislation. Otherwise how can you challenge it in court?
So I can install a row of individual led spotlights across my roofline but if they are in a single housing (ie lightbar) I can't? :-/
C