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What is a zipper merge?​

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 vs. early merge​

When most drivers see the first “lane closed ahead” sign in a work zone, they slow too quickly and move to the lane that will continue through the construction area. This driving behavior can lead to unexpected and dangerous lane switching, serious crashes and road rage.

Zipper merging, however, benefits individual drivers as well as the public at large. Research shows that these dangers decrease when motorists use both lanes until reaching the defined merge area and then alternate in "zipper" fashion into the open lane. Watch a brief video about how it works.

Benefits​

  • Reduces differences in speeds between two lanes
  • Reduces the overall length of traffic backup by as much as 40 percent
  • Reduces congestion on freeway interchanges
  • Creates a sense of fairness and equity that all lanes are moving at the same rate

So I'm supposed to merge late?​

Yes! As you see the “lane closed ahead” sign and traffic backing up, stay in your current lane up to the point of merge. Then take turns with other drivers to safely and smoothly ease into the remaining lane. When traffic is heavy and slow, it is much safer for motorists to remain in their current lane until the point where traffic can orderly take turns merging.



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What is a zipper merge?​

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 vs. early merge​

When most drivers see the first “lane closed ahead” sign in a work zone, they slow too quickly and move to the lane that will continue through the construction area. This driving behavior can lead to unexpected and dangerous lane switching, serious crashes and road rage.

Zipper merging, however, benefits individual drivers as well as the public at large. Research shows that these dangers decrease when motorists use both lanes until reaching the defined merge area and then alternate in "zipper" fashion into the open lane. Watch a brief video about how it works.

Benefits​

  • Reduces differences in speeds between two lanes
  • Reduces the overall length of traffic backup by as much as 40 percent
  • Reduces congestion on freeway interchanges
  • Creates a sense of fairness and equity that all lanes are moving at the same rate

So I'm supposed to merge late?​

Yes! As you see the “lane closed ahead” sign and traffic backing up, stay in your current lane up to the point of merge. Then take turns with other drivers to safely and smoothly ease into the remaining lane. When traffic is heavy and slow, it is much safer for motorists to remain in their current lane until the point where traffic can orderly take turns merging.



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No one in Atlanta knows what a Zipper merge is.

The odds of drivers taking turns to merge is very low.

Once you're out of the city, common sense driving is much more common.