The Zipper Traffic Merge

3476-MergeSign&Tab

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

1

Midtown Bridge getting a face-lift

2

 The Zipper point

3

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?

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s