In traffic engineering, the late merge or zipper method is a convention for merging traffic into a reduced number of lanes. Drivers in merging lanes are expected to use both lanes to advance to the lane reduction point and merge at that location, alternating turns.
The late merge method contrasts with the early merge method. A related scheme is the dynamic late merge.
The late merge method has not been found to increase throughput (throughput is the number of vehicles that pass through a point in a given period of time). However, it considerably reduces queue (“backup”) length (because drivers use the ending lane until its end) and reduces speed differences between the two lanes, increasing safety.
Governments hold campaigns to promote the late merge method because irritation, aggression and feelings of insecurity easily occur while “zipping”. Often drivers who change lanes too early do not like to see other drivers continue until the end of the drop-away lane, even though this late merging is encouraged by the authorities.
I watched this today and it didn’t work the way it should. Most drivers in the through lane would not late the vehicles in the ending lane in. No alternating turns here. People are just too impatient.
Construction season in Winnipeg
Midtown Bridge getting a face-lift
The Zipper point
The guy in the light colored pickup had a hard time getting someone to let him in.
Why does driving turn some people into complete wingnuts?