> The quotation from someone at the California Highway Patrol does uses the phrase "between lanes," but obviously doesn't mean that. If you read it in context, you see this author is using the term "lane" to refer to a line of cars.
"lane sharing, filtering or white-lining, refers to the process of a motorcyclist riding between lanes of stopped or slower moving traffic"
White-lining is rather suggestive synonym, don't you think? So if you're right about their use of terminology, then no, the context wasn't clear. White-lining sure sounds like "lane straddling" to me.
On the other hand, I don't see that staying on one side of the line or not makes much practical difference to the California drivers (human and computer) who need to watch out for these faster-moving motorcycles when changing lanes, so this wasn't really a key point -- I'm done trying to figure out what the policy really is, since I don't ride a motorcycle.