In many cases the lanes weren’t designed for zipper merging or drivers “zipper merge” at inappropriate places. Zipper merge is great! But not all merging is to be a zipper merge- this is constantly abused, and perhaps justified in the minds of offenders under the guise of the zip. A lane, such as an entrance lane, that terminates is a good time to zipper merge. But many many times, in Minnesota, people use any lane that allows them to cut to the front of the line. Regardless if that causes a massive slowdown as they leave the relatively free flowing lane and “zipper merge” - match speed of the slow lane. Articles would do well to mention the finer points before ushering us to 10% gains... maybe.