Zipper merge when two lanes are combining or merging, great. That doesn't excuse people on 695 stopping the left hand lane on this multi-lane highway, because they want to drive up all the way to the point that exit 23A is Ying off before merging over, even though there is a really long solid-white line turning lane for a good distance before the turn. Every single morning back when I made that commute there would be stop and go traffic for all the different lanes on the highway because people were doing that.