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High throughput T junction in action

https://forums.factorio.com/viewtopic.php?f=194&t=78289

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High throughput T junction in action

Posted: Sat Nov 23, 2019 8:03 pm
by coppercoil
T junction video

This junction is optimized for 10-car trains.
Here is a small control circuit that interrupts single direction movement if there are other trains waiting too long. Junction can work without it, but distribution is smoother with it.
2T10.jpg
2T10.jpg (3.86 MiB) Viewed 8045 times

BP with control circuit


BP without control


Continued below due to post character limit.

Re: High throughput T junction in action

Posted: Sat Nov 23, 2019 8:04 pm
by coppercoil
I also made X junction despite I never use it.



X junction video

2X10.jpg
2X10.jpg (6.98 MiB) Viewed 8044 times

Re: High throughput T junction in action

Posted: Mon Dec 23, 2019 5:14 pm
by ickputzdirwech
This is a very interesting concept. Can you post any comparison with a version that uses only one lane per side?

Re: High throughput T junction in action

Posted: Mon Dec 23, 2019 5:46 pm
by dee-
It's pretty!


As the train junction optimization threads pop up every so often, maybe it's time we make a challenge out of it! 8-)
- Specify the base layout, e.g. a T-junction with left/right/bottom ports
- Have a number of i,j,k trains with:
- - a start train stop just for every train
- - a FIXED destination train stop for every train
- - having a FIXED delay timer when they each start to roll
- - being composed of a mixed/uniform train/carriage composition

Thus you have a list of:
- train t with structure "CCCCCCCC>>" (eight carriages, two trains going forward) starts at its train stop at junction entry left/right/bottom, wants to go its train stop at junction exit reft/right/bottom and waits for n seconds before it starts moving

This way we can finally thrive for the Optimal Junction (tm) in a controlled environment and can measure the effectiveness.

@DaveMcW ?

Re: High throughput T junction in action

Posted: Tue Dec 24, 2019 8:12 am
by brunzenstein
The video link doesn't work

Re: High throughput T junction in action

Posted: Tue Dec 24, 2019 8:38 am
by Koub
brunzenstein wrote: ↑
Tue Dec 24, 2019 8:12 am
 The video link doesn't work
It does.

Re: High throughput T junction in action

Posted: Tue Dec 24, 2019 8:43 am
by brunzenstein
The link does not work on a Mac or on iOS

Re: High throughput T junction in action

Posted: Tue Dec 24, 2019 10:39 am
by dee-
brunzenstein wrote: ↑
Tue Dec 24, 2019 8:43 am
 The link does not work on a Mac or on iOS
Do you have an ad-blocker / JavaScript-blocker active?
The video itself is hosted at gfycat, which might be blocked (I had to allow it too, because I block everything active/media not 1st-party).

Maybe use a different browser like Firefox and/or add missing codecs.

Perhaps use Homebrew on Mac.

Sorry to say but it's a problem on your end / platform selection.

Re: High throughput T junction in action

Posted: Wed Dec 25, 2019 11:01 am
by hansjoachim
Cool cool, I like it.
It looks like a 10car version of a intersection I have, but with extra right turning lanes.
You can cut quite many lanes on both the 3 and 4 way intersection. Here is a pic where the lanes marked red can be cut and you keep the same throughput.

Re: High throughput T junction in action

Posted: Wed Dec 25, 2019 7:23 pm
by coppercoil
hansjoachim wrote: ↑
Wed Dec 25, 2019 11:01 am
 You can cut quite many lanes on both the 3 and 4 way intersection. Here is a pic where the lanes marked red can be cut and you keep the same throughput.
No, you shouldn’t cut red marked lanes. I have tried it, but traffic jam was forming here. Actually, you can cut some of lanes if you know for sure that traffic load will be low in that direction. This is a very common situation in a real game, where we have busy highway with many branches to local factories that are not so busy. For this case lightweight junction can be used.
TJuntionLight.jpg
TJuntionLight.jpg (3.58 MiB) Viewed 7575 times


That junction in the first video is designed to connect two equal highways.

Re: High throughput T junction in action

Posted: Sun Sep 20, 2020 8:21 am
by aka13
Great junction, thx for sharing!

Re: High throughput T junction in action

Posted: Sun Sep 20, 2020 8:34 am
by brunzenstein
What’s the settings for the combinators and how does it work?

Re: High throughput T junction in action

Posted: Sun Sep 20, 2020 2:15 pm
by coppercoil
brunzenstein wrote: ↑
Sun Sep 20, 2020 8:34 am
 What’s the settings for the combinators and how does it work?
I can’t remember all details by now. I didn’t had discovered Attach Notes mod at that time. Though I remember the main idea.

Rail signals 0123 (direction left->right), 4567 (left->bottom) and 89IJ (bottom->left) determines, if there are trains waiting at the junction and their exit lanes are available. That’s mean, awaiting train must have a guarantee for clearance to avoid deadlocks. So, there are two rails signals for each signal: one looks for red before junction, and another looks for green right after it. If some signal has a value 2, it means “make request for crossing”, and triggers counter T. After slight delay (300 tics) current traffic flow is closed by signals UVW. Current flow is determined by "activity detector" signals ABC (yellow on chain signals).
When junction becomes available and trains starts to move, they trigger corresponding activity signal ABC that resets timer and releases closing rail signals.

P.S.
Circuit HUD mod can be useful for circuit debugging.
All times are UTC
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