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It's what you get used to, I guess.
It's common now in Austin but mostly because of the influx of Norcal riders. I don't think it's specifically legal or illegal however.
and deserve their own legal niche of allowances.
I'm assuming this new law is not for the interstates, It says "where the posted speed limit is 45mph or less. Doesn't apply to any interstate in AZ or probably anywhere else.