zipper merge

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When a lane is closed in a construction zone, a zipper merge occurs when motorists use both lanes of traffic until reaching the defined merge area, and then alternate in "zipper" fashion into the open lane.

Zipper Merge - MnDOT 2025
If the zipper merge applies, the only point where drivers in the continuing lane should yield to those in the ending lane is where the two lanes become one. At that point, care should alternate one from every other lane.

What actually counts as a "zipper merge"? Life_Temperature795 2025