I have never actually heard of anyone getting ticketed for filtering through traffic when it was stopped, as long as they were not being a-holes about it. Have even talked to people who have done it in front of cops where it is illegal. I think most actually intelligent people understand it helps cut down on traffic congestion and is safer.Filtering at a light is a no-brainer.
#1 cause of MC fatalities in an urban environment...right of way (usually left turns into path of MC).
#1 injury causing collision in urban environment...rear-ender.
Still baffles me to see this "right" (Ca) not practiced by folks in hideous surface street traffic. Lane splitting at speed spooks some folks. Totally get it. But filtering has proven (in several studies) to decrease injury and risk for riders. Ignorance within state legislations is the primary reason for not allowing this practice ("We gotta save lives of riders who don't know as much as we who don't ride..."). I filter wherever I ride. F-it, I'll take the citation. Just the price of riding. Distracted minivan driver or texting teen plowing into my ass? Not if I can help it.