What's the deal with motorcycles that zoom so fast between the lanes of parked cars? They always approach loud and fast, and I'm like-- whoa buddy--- you're gonna whack somebody! One big rear view mirror and we're all parked there for an hour while the EMTs pick him up off the road. They call this "lane-splitting" when traffic is moving, and "filtering" when traffic is stopped. It's totally legal in the U-S and some argue it keeps traffic flow moving and reduces rear end collisions.