zipper merge

From the resemblance to the closing of a zip fastener, where alternating teeth are brought into line.

zipper merge (plural zipper merges)

1. A convention for merging traffic into a reduced number of lanes, where drivers use both lanes to advance to the lane reduction point and merge at that location, alternating turns.

zipper merge (third-person singular simple present zipper merges, present participle zipper merging, simple past and past participle zipper merged)

1. To carry out this form of traffic merging.