Observed arrival · 2026-11-01
Zipper Merge: Use Both Lanes, Take Turns
An interactive traffic simulation and sourced explainer show how zipper merging changes the shape of a queue without increasing how many cars get through.
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Drivers navigating lane closures and roadwork
- Worth noticing
- The page says field studies find queues about 8–35% shorter, while zipper merging does not increase throughput.
Field notes
The simulation compares a visitor-selected zipper-merging behavior with a run in which typical drivers move over early. Visitors can inject the same car into both roads, adjust playback, and follow queue length over time. The page says no queue forms below about 1,300 cars per hour, so the comparison matters chiefly once traffic backs up; it also distinguishes shorter queues from increased throughput.
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Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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