Isn't filtering when you "filter" thru the entire pack at the light and wind up at the front? I'm just talking about pulling in between the back two cars so you're not at the very end to be hit, and AFAIK the legality of "lane-splitting" is what allows both behaviors.
But I'm from MN and we don't have it here, so mebbe I'm wrong. I did google and wiki before forming that opinion tho. See, I always thought "lane-splitting" must refer to two motorcycles sharing a lane side-by-side, which many states allow. The other definition sounds nuts to me, but turns out thats what it is.
miker