noun
zipper merge
Traffic engineering term for the practice where drivers in two lanes merge alternately like a zipper, especially when a lane ends.
渋滞を減らすために、ファスナー合流が推奨されている。
Zipper merging is recommended to reduce traffic congestion.
Compound of ファスナー (fasunā, 'zipper') and 合流 (gōryū, 'merging, confluence'), likely a calque of English 'zipper merge'.