I guess they are just going ahead and "codifying" it, since it wasn't generally ticketed very often if it was done "safely."
I know it's a hotbutton emotional issue for some. Personally, I don't like doing it (I'm in SoCal.) But, if the traffic is dead stopped,
I'll do it very slowly and carefully, wave thanks if anyone moves over a bit to make more room, etc. As soon as the flow starts
back up, I move back into the lane. Yes, there are those riders who blast through at 60+ mph; it's crazy and dangerous.
Oh well, let the debates begin... By the way, CHP officers do it all the time to get to the scenes of accidents, etc. And of course
it's all over Europe; they call it "filtering" I think.