I don't think motorcycle data on lane splitting is particularly relevant, because motorcycles are able to keep up with traffic. If a cyclist can't lane-split,

I don't think motorcycle data on lane splitting is particularly relevant, because motorcycles are able to keep up with traffic. If a cyclist can't lane-split, then what are they supposed to do up a hill? If they take the entire lane drivers get annoyed, if they don't take the entire lane (and follow the common guideline of riding as close to the edge as safe and practical) then you claim they are doing the wrong thing too?