The next time a driver waits until the last minute to merge in traffic, try to remain calm. They are doing us all a favor.
The “late merge” or “zipper merge” method is recommended by many transportation authorities and is official policy in some states such as Utah, Illinois, North Carolina, and Ohio.
This video from the Automobile Association of Alberta, Canada, shows how and when this approach is most effective.
When traffic is flowing normally, drivers should merge whenever reasonable. However, if there are moderate to heavy traffic conditions or lane closures, it is best to merge later to avoid back-ups and accidents.
Experts point out that when drivers merge at the edge of their lanes and (politely) allow other drivers to do the same, more lane space is utilized and traffic flows more smoothly. are.
Diagram showing how the “zipper merge” approach reduces traffic backups. (North Carolina)
On the other hand, merging early can cause drivers to slam on their brakes and block free lane space, causing a sudden drop in speed and increasing the risk of an accident.
Colorado Department of Transportation research shows zip ties can reduce delays in congested areas by up to 40%.
“It takes some cooperation, but it maximizes road space and keeps things running smoothly,” said Kurt E. Gray, director of driver training for AAA.
Despite the study, California has yet to officially endorse it.
“Caltrans is aware of ‘zipper merging’ but does not investigate or study it. We do not promote it to the public,” a Caltrans spokesperson told KTLA.
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