A threshold guardian is often just a guy in the slow lane of the story appointing themselves traffic police. Like those truckers who decide to straddle merging lanes to enforce “fairness” when a full capacity zipper merge would in fact be more efficient.
The book references a paper. I don’t think human factor matters since it cancels out in both merge patterns, leaving net inefficiency of extra length of unoccupied lane causing backup to extend longer etc. And even if batch merges are better, blocking is still meaningless.
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Yeah this is why I'm curious to visualize an example, not just of the zipper but also of the less efficient alternative. I'm not sure what it's up against. (Agreed blocking lanes isn't productive.)
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My assumption is that merges could happen earlier where traffic is less dense, which minimizes the impact on flow (speed) since humans are better then there's plenty of room. With an aim of maintaining maximum speed into and through the bottleneck, which determines bandwidth.
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