Have you seen the road sign “Right lane closed ahead, merge left,” but while you move to the left lane, other cars fly by you in the right lane? Then they duck into the left lane ahead of the ...

The zipper merge can be an effective method to manage traffic in congested construction zones. The Michigan Department of Transportation rolls out road signs to notify drivers where it is in place ...

It’s called a “zipper merge” because it works like the teeth of a zipper, and many states are studying the idea and the best road signs to explain how drivers should do it.

Perhaps you've seen this sign where southbound I-85 meets NC 147. NCDOT is studying whether the zipper technique can reduce congestion, but drivers say they are thoroughly confused by the new sign.

Many drivers, when they see a “lane closed ahead” sign, move over right away, doing the long-established early merge.

Road signs are simple and effective ... at least you would hope so since they've been around since the invention of the dirt road.

Question: I read your last article about road construction and work zones. Can you talk about the zipper merge? It seems like a lot of people don’t know what it ...

If you ever needed to embrace the zipper merge, now is the time when driving Fort Collins' busiest road into the city from Interstate 25. Unless you prefer to wait even longer in traffic on ...

Zipper merge signage from the Michigan Department of Transportation. In work zones where traffic volume is high and average speeds are slowed, the zipper merge technique is recommended to improve ...

The study found that three signs ahead of a zipper merge could help drivers use the preferred merging method.