To my understanding in intensive traffic it's more about uniform and predictable behaviour. First option will not improve since (at least in Europe) it just ch

To my understanding in intensive traffic it's more about uniform and predictable behaviour. First option will not improve since (at least in Europe) it just changes lane priority. In linked article's merge case priority traffic is in left lane, since right one merges. In your center merge case priority traffic is on the right (when doing simultaneous merges to center lane, one on the right has priority over the one on the left). So it probably won't change anything. Barrier option is much better, but it has challanges and restrictions of their own. Edit: Oh, and I forgot to mention that over here in Latvia I see people starting to respect zip merging. It's all in our head. Not because government said, but because everybody follows simple rule and everybody gets home faster and with less stress :)