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Re:Washington, Minnesota officially endorse a “safer, faster... by peeters on Thursday July 24, 2014 @05:18PM (#8082259)
> It is optimal only when the local driving culture allows it to be.

Yeah, which is why almost the entire article was about the campaigns to change the culture, not about justifying zipper merging as optimal.

Re:Washington, Minnesota officially endorse a “safer, faster... by slantyyz on Thursday July 24, 2014 @05:55PM (#8082523)
Fair point, but it's easier to successfully campaign a low density region (i.e, a state with around 7M people like Washington) than a high density metro area (the metro area where I live in has 6M people, so traffic is already a daily nightmare).

Those campaigns in Washington and Minnesota just wouldn't fly here.

When our metro population was around <=3M, people still zipper merged (in the mid 90s and earlier).