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re: What is so difficult about the zipper merge concept?

Posted on 8/11/25 at 8:57 am to
Posted by The Third Leg
Idiot Out Wandering Around
Member since May 2014
11504 posts
Posted on 8/11/25 at 8:57 am to
I hope cart narcs humiliates you one day, Lazy Bones

You’re a POS if you leave carts in lots. Just like you’re a POS if you block zipper merging.
Posted by CarRamrod
Spurbury, VT
Member since Dec 2006
58261 posts
Posted on 8/11/25 at 9:20 am to
quote:

I hope cart narcs humiliates you one day, Lazy Bones
He throws a magnet on my car i will press charges just as he would if someone where to get physical with him when he harasses people.
Posted by lsu for the win
Member since Jun 2022
1572 posts
Posted on 8/11/25 at 10:07 am to
Because all Louisiana drivers are assholes and are conditioned from a very young age that letting anyone merge in front of you is a sin and will demonstrate that you are weak.
Posted by Lake08
Member since Jun 2023
2778 posts
Posted on 8/11/25 at 10:10 am to
You aren’t getting in front of me.
Posted by OvertheDwayneBowe
Member since Sep 2016
3442 posts
Posted on 8/11/25 at 10:22 am to
quote:


quote:
Because traffic volume usually exceeds the single lane capacity causing traffic to backup
no shite sherlock... This usually happens when there is construction on a 2 lane road... 2>1


quote:
Merging earlier streamlines the process in the real world.
no it doesnt... it just moves the bottleneck further away from the merge causing congestion in other areas.

quote:
It never works like the nifty “zipper merge is the way” infographics.
because 1 dipshits try to merge eariler and black 1000ft of lane which could fill with traffice to reduce the congestion other places. and 2 dickheads done let people merge in because they are assholes.


I think the irony is that everyone is arguing the same thing: there should be a singular zipper merge point.

For some reason some people think that point should be upstream of the final merge point because they know better.
Posted by Demshoes
Up in here
Member since Aug 2015
10659 posts
Posted on 8/11/25 at 10:25 am to
quote:

And as an aside, if you are in the merge lane and don’t let the merge car in, you deserve to go to hell. It’s a one-and-one concept.


Ego w/ a dash of rage.
Posted by Big Scrub TX
Member since Dec 2013
38171 posts
Posted on 8/11/25 at 11:16 am to
quote:

Throughput of a single one is the same and would move smoother if merging occurs in the mile leading up to the merge at full highway speed.
Except in real practice, this becomes one virtue signaler taking 3 minutes to merge, blocking an entire stretch of open lane that could have been used.
Posted by DakIsNoLB
Member since Sep 2015
1234 posts
Posted on 8/11/25 at 11:21 am to
quote:

I think the irony is that everyone is arguing the same thing: there should be a singular zipper merge point.

For some reason some people think that point should be upstream of the final merge point because they know better.


Yes. There's no realistic way to get an at-speed, seamless zipper merge. There's too much traffic. It's the same amount of traffic trying to get through half the opening, so a near complete stop is inevitable.

Both lanes need to run full all the way to the merge point and then the drivers at the front alternate getting through the closure. Won't happen, but it's why I don't let anyone over until I get to the lane closure.
Posted by Cheese Grits
Wherever I lay my hat is my home
Member since Apr 2012
60565 posts
Posted on 8/11/25 at 11:25 am to
quote:

My uncle as a kid zipped his nuts up after swimming in the midwest.


Can not happen with button fly.
Posted by Beauw
Blanchard
Member since Sep 2007
4024 posts
Posted on 8/11/25 at 11:25 am to
Logically and mathematically, this is 100% correct, emotionally, people are bitches and get mad….. so it’s useless to argue.
Posted by Shorts Guy
BR
Member since Dec 2023
473 posts
Posted on 8/11/25 at 11:25 am to
The biggest problem is that, although it’s much more efficient, it’s also non-intuitive. We spend our whole lives being taught to get in line and wait our turn. So there’s a whole bunch of people who aren’t educated about how traffic flows who think you’re “cutting” the line and refuse to let you in.

For it to ever work how it should work, everybody would have to be on the same page and be OK with someone merging in front of them. A solid 75% of the population is incapable of that, so the perfect zipper merge is just a pipe dream.
Posted by AlxTgr
Kyre Banorg
Member since Oct 2003
86146 posts
Posted on 8/11/25 at 11:32 am to
quote:

It’s ok to ride that lane until the cones and then get in. In fact, that’s how it was designed.
Except this doesn't work. See the green cars always in motion? That doesn't actually happen. A full stop occurs. If people zippered farther back allowing the pinch point to continue to move, it would be ideal.
Posted by AwgustaDawg
CSRA
Member since Jan 2023
13095 posts
Posted on 8/11/25 at 11:43 am to
How adults do not understand that the DOT kind of knows what they are doing with volume and lanes. There are more than one lane for a reason...VOLUME. When it is necessary to shut them all down but one why everyone wants in that one 8 miles back is a mystery. Whats worse is the a-hole truck drivers straddling the dame line blocking both lanes for several miles so they do not have to do anything other than idle along while they back up traffic for thousands of other folks just trying to get somewhere. Here's a tip, skippy, the DOT built multiple lanes for a reason....your personal vendetta against people doing what is required BY law and common sense by using every lane to the merge point is a sure sign you ought not be driving anything, let alone a truck. We have 6 trucks doing this on I4O between NC and Tennessee Friday....had traffic backed up almost to Asheville....alll because 6 assholes can't stand for someone to get in front of their slow moving arse. There is a pretty good chance that I40, which is about 2200 miles long and stretches between Wilmington NC and Barstow CA is going to have a lane closure somewhere at any given moment....if straddling the lanes 8 miles before that lane closure is a good idea why not 2000 miles before it???? Exactly.....
Posted by AwgustaDawg
CSRA
Member since Jan 2023
13095 posts
Posted on 8/11/25 at 11:47 am to
quote:

Because traffic volume usually exceeds the single lane capacity causing traffic to backup. In addition it’s almost always accompanied by a reduced speed further causing backups.

Merging earlier streamlines the process in the real world. It never works like the nifty “zipper merge is the way” infographics. Leaving only assholes trying to zip up and force their way into bumper to bumper already merged traffic. Sometimes on the shoulder causing reasonable people to rage


Reasonable people do not rage, reasonable people proceed to the merge point in the lane they are in and allow anyone who needs to merge to do so at that point. It is not the people utilizing both lanes that cause the backup. it is the assholes who won't allow people to merge when it is the fricking law to do so.


I used to enter a gate on a government facility every morning at 6 am and there were 2 lanes that merged into one through the gate. At some point the DOE decided to enforce the law, which is to zipper merge, by initially writing warning tickets to people who would not allow traffic to merge and finally writing actual tickets....and it went from about a 45 minute ordeal every day to about a 5 minute nuisance...in about 2 weeks. No change in volume, no change in lane usage, just simply enforcing a law which exists in most states but for certain exists in Washington State.
Posted by Sun God
Member since Jul 2009
49476 posts
Posted on 8/11/25 at 11:50 am to
Defending zipper merging is like getting mad at everyone not going at once after a light turns green

Mathematics are pointless in these scenarios
This post was edited on 8/11/25 at 11:50 am
Posted by AwgustaDawg
CSRA
Member since Jan 2023
13095 posts
Posted on 8/11/25 at 11:54 am to
quote:

Wrong.

It's a basic Operations Management case study.

If merging earlier worked best, let's just move the merge point 2 miles further upstream. How about 10 miles? The earlier the better, right?!

Wrong. The shorter the 1-lane is in use, the less lag is introduced. There are literally Ops Mgmt algorithms for this.


Spot on.


I40 is shut down in several places between Asheville and Knoxville. Both states have signs stating to use BOTH lanes to the merge point and to allow cars in the lane that is closing to merge....and includes the law which requires this. Of course people pay it no mind, god forbid someone actually use the highway as its designed and not the way their feelings wishes they would...so the refuse to allow anyone to merge, straddle the line blocking both lanes of traffic and in the process makes the problem infinitely worse. If it is a good idea to merge 3 miles from a lane closure and abadon the open lane why not at 1000 miles????? There is apt to be a lane closure somewhere on an interstate in the US. We all know this is so....so if the best way to deal with it is for everyone to merge into the open lane why not do so the entire length of the highway? If it is the best practice 1 mile away it is 1000 times better to do so 1000 miles away. Obviously that is a stupid idea. 1 mile or 1000.....there is X amount of volume. Why in the frick some people think it all has to be one lane several miles from where it actually has to be one lane is beyond me but I know many people can not tolerate anyone using the lanes as they were designed to be used and possibly getting in front of them.....because those people are, with all due respect, fricking idiots.
Posted by AwgustaDawg
CSRA
Member since Jan 2023
13095 posts
Posted on 8/11/25 at 11:59 am to
quote:

This. Traffic is almost always way backed up when you encounter it. Zipping up to the merge point and squeezing in benefits 1 driver and penalizes 300 others . It does not cause the existing backup to magically dissolve. It exasperates the problem


If this were true the thing to do is for EVERY vehicle use one lane the entire length of highway. If it is a good idea 1 mile, 5, 10 or 20 from a lane closure it is a good idea 1000 miles away because there is apt to be a lane closed somewhere along the route at any given time. If it is a good idea a mile away from a lane closure the same logic would apply on I-20 west bound in Atlanta if a lane were closed in west Texas....
Posted by AwgustaDawg
CSRA
Member since Jan 2023
13095 posts
Posted on 8/11/25 at 11:59 am to
quote:

Sorry if you can’t connect the dots that the speed limit dropping from 70 to 45 in a one lane interstate construction zone will cause a backup.


It will cause a slowdown....the reason it causes traffic to stop is people who can not tolerate the idea of someone getting one car length ahead of them in traffic.
Posted by Rabby
Member since Mar 2021
1418 posts
Posted on 8/11/25 at 12:32 pm to
quote:

So I’m not an a-hole for driving in the right lane all the way to the tunnel in Mobile?
We have no idea whether Alabama has accepted the zipper merge yet.
Follow the guidance where you drive so you are not an a-hole.
Posted by CarRamrod
Spurbury, VT
Member since Dec 2006
58261 posts
Posted on 8/11/25 at 1:11 pm to
quote:

is like getting mad at everyone not going at once after a light turns green
what are you talking about? You do know there is a reaction constant you multiply buy the slot you are in to calculate "when" you should be able to press the gas peddle? No traffic model just starts all cars moving at the same time.

The problem is the actual reaction time is getting longer and longer because retards sit there and play on their phone instead of driving.
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