There are really two "issues" with the zipper merge. I hesitate to use the word "issues", as they are a fault of people, not the process.
- Everybody needs to be doing the same merge. Doesn't matter if it's zipper or the "get over as time permits", the problem is if not everybody is on the same page. The zipper is the better of the two as far as that is concerned.
- If you are already in the lane that continues, you should not change lanes into the lane that ends. Sometimes this is marked with lane markings, however that isn't always possible if the lane exits as well as ends.
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