This works pretty well where I live. Here in Vancouver, a major bridge that takes traffic into the downtown core is only 3 undivided lanes. There's a huge amoun

This works pretty well where I live. Here in Vancouver, a major bridge that takes traffic into the downtown core is only 3 undivided lanes. There's a huge amount of traffic flowing over this bridge in the morning as it connects work to home for somewhere in the range of 60,000 - 70,000 commuters daily. From the residential side of the bridge, traffic zipper merges from 4 lanes into either one or two depending on the time of day. The traffic is coming from two different sources (west and east) so each source will zipper merge and then the zipper merged lanes will zipper merge onto the bridge. I honestly have no idea what this would look like any other way. Zipper merges are obvious and natural if you set them up right - what it takes is the knowledge to do it. Once people know that they should be yielding to the mergers, the whole merge process speeds up considerably.