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Road Zipper machine at the Golden Gate Bridge, San Francisco, California. A barrier transfer machine, also known as zipper machine or road zipper, is a type of heavy vehicle that is used to transfer concrete lane dividers, such as Jersey barriers, in order to relieve traffic congestion during rush hours. Many other cities use them temporarily ...
A reversible lane, also called a zipper lane, is in use on eastbound Interstate H-1 for traffic heading from Leeward Oahu to Pearl Harbor. It is open from 5:30 to 9:00 a.m. [32] The Golden Gate Bridge (6 lanes total, 2 reversible), connecting San Francisco with suburban Marin County.
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A 'Queue in both lanes' sign orders drivers to use both lanes up to the merge point Zipper method road signage in Warsaw. The late merge method, also known as zipper merging, dictates that both streams of traffic should continue to drive up to the point of closure of one stream and merge at the marked taper.
I-285 perennially ranks among the most congested stretches of highway in the nation, averaging 250,000 to 300,000 vehicles per day.
Today, there are more than 25 million Botts' dots in use in California, [6] though they have started falling out of favor. In 2017, Caltrans announced that it would stop using Botts' dots as the sole indicator of lane division, due to cost and worker safety, and in order to make roadways more compatible with self-driving cars.