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The Zipper Merge: Techniques to Keep Traffic Moving

Merge points are specifically set up for vehicles to merge from two lanes into one lane in a "zipper fashion." This keeps traffic flowing. Each car should alternate "zipper fashion" into the remaining open lane just before the point of closure.

Here's how the Zipper Merge works:  When there is a lane closure ahead, drivers should continue to drive in both lanes equally. Just before the lane ends, cars should take turns filling in the open lane carefully and resume full speed. In a Zipper Merge, please be respectful of those who wait to merge until just before the lane ends; they are doing it correctly.  Check out this short CDOT video on Merging.