3 and 4 way intersections

Smart setups of railway stations, intelligent routing, solutions to complex train-routing problems.
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TBTerra2
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Re: 3 and 4 way intersections

Post by TBTerra2 »

im unsure how well the tester will deal with these, but i find them very useful in mega bases
4 lain mainline with a 2lane branch off it. the pathing weights have to be modified abit to get it working right (should have about equal spawns/outputs for each seperate direction, and 4lane parts should have about twice the spawns as 2lane)
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hansjoachim
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Re: 3 and 4 way intersections

Post by hansjoachim »

TBTerra2 wrote: ↑Sat Oct 26, 2024 12:40 pm im unsure how well the tester will deal with these, but i find them very useful in mega bases
4 lain mainline with a 2lane branch off it. the pathing weights have to be modified abit to get it working right (should have about equal spawns/outputs for each seperate direction, and 4lane parts should have about twice the spawns as 2lane)
LHD
RHD
10-26-2024, 13-39-03.png
The everything test handles it fine and is pretty balanced. Spacing got messed up though XD Have to make a seperate catagory for this one=)
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Bocian
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Re: 3 and 4 way intersections

Post by Bocian »


Test results from RailTester in BP descriptions. Sorry I cut off the decimals... Everything is rounded down unless it was something like .98 where I'd round up. Settings were as follows, except I tested for a bunch of train configs:
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All of these intersections are optimised primarily around 6 car trains, and secondarily 3 and 2 cars. All RHD.
All designs aside from Paperclip are mine made before SA with Fake New Rails first, now recreated with real ones. Paperclip was posted in LHD version on Factorio Discord by Xortle - I just made an RHD version and named it.
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hansjoachim
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Re: 3 and 4 way intersections

Post by hansjoachim »

[/quote]
Tried testbenchcontrols 2.0.4 but it still detects this intersection as LHT
[/quote]

Now i re did the 1.1 to 2.0 conversion and LHT/RHT should be fixed, including also the Everything test and also a couple other things:)
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mmmPI
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Re: 3 and 4 way intersections

Post by mmmPI »

Reverse Manual Nightmare

RHT- 4 tile spacing between rails
Size : 96x96 = 3 chunks

If you drive horizontal, you can go manual, but if you go vertical, no, it is all in reverse, hence the name.
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lucyisgamer
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Re: 3 and 4 way intersections

Post by lucyisgamer »

Chunky Mk. 4
RHT - 4 tile spacing
Size - 96x96 (3x3 chunks)

Originally built for 2-4 trains for easy comparison with the ones in the list, I've also tested with 2-8 trains, as that's what I'll end up using.
Test Results
Size | Set 1 | Set 2 | Set 3 | Score
2 - 4 | 101.79 | 106.42 | 113.62 | 107.28
2 - 8 | 64.53 | 66.60 | 84.87 | 72.00
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I might take some time and make a LHT version of this, we'll see :)

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OzarkRanger
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Re: 3 and 4 way intersections

Post by OzarkRanger »

MJDSys wrote: ↑Thu Oct 24, 2024 8:57 pm I played around with a bowed 4 way cross after seeing some other examples and it has slightly higher performance. It's also single chunk aligned:
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I was working on something similar and ended up with a symmetrical version of the same. It still fits into a 32x32 chunk, but the performance is slightly worse for some reason.
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This is my first time using the testbench and I couldn't get it run more than one set for some reason. If someone who knows what they're doing can retest this, I would appreciate it.
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It also expands nicely from the three-way equivalent:
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Interestingly, this only uses 56 pieces of rail compared to 68 for the straight version, which makes it very tempting to switch entirely to rick-rack train lines. :)
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Avona
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Re: 3 and 4 way intersections

Post by Avona »

grossws wrote: ↑Fri Oct 25, 2024 11:03 pm Tried testing newly designed intersections and I got slightly different results on my naive intersection updated for 2.0 (one plane) than similar looking Avona's "Symmetrical Cross". Likely because of a bit different signalling on right turns.
It's more than the right turns, it's the fact that I signaled all of the merges and splits differently. You don't need chains before merges or splits (unless it's a merge directly into a split). And the extra space that the chain blocks take up will reduce the throughput of your intersection significantly.
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Re: 3 and 4 way intersections

Post by akulen »

I made a probably overkill 4 lane 4 way intersection. The blueprint includes exchangers as the right lane can't turn left (RHT).
It is signaled for 2-4 trains, but there is enough room to signal it for bigger trains, though the exchangers would need to be extended.
It was designed to be exactly 9 chunks wide, and rotationally symmetric.

Blueprint: RHT, Size: 288 x 288, Spacing: 4 tiles, Train length: 2-4
RHT: Set1: 136.73, Set2: 143.37, Set3: 147.87


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Factoriointersection
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Re: 3 and 4 way intersections

Post by Factoriointersection »

Awesome guys! some really nice intersections! I added almost all. And updated the forum. Lots of intersection on there now=)
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grossws
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Re: 3 and 4 way intersections

Post by grossws »

Avona wrote: ↑Mon Oct 28, 2024 6:45 am
grossws wrote: ↑Fri Oct 25, 2024 11:03 pm Tried testing newly designed intersections and I got slightly different results on my naive intersection updated for 2.0 (one plane) than similar looking Avona's "Symmetrical Cross". Likely because of a bit different signalling on right turns.
It's more than the right turns, it's the fact that I signaled all of the merges and splits differently. You don't need chains before merges or splits (unless it's a merge directly into a split). And the extra space that the chain blocks take up will reduce the throughput of your intersection significantly.
I know I technically don't need chain signals there thought it's a bit of habit. I was surprised that my variant I thought suboptimal somehow shows better throughput while it shouldn't. I'll test your variant later to have comparison in the same environment
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Re: 3 and 4 way intersections

Post by mmmPI »

3 Chunk Square
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I made this junction trying to optimize for the test bench, but i noticed the test bench adds some rails that invalidate the signals, if removed manually , the junction seem to score good , but i don't want to publish my own non-official results.
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Re: 3 and 4 way intersections

Post by Factoriointersection »

mmmPI wrote: ↑Tue Oct 29, 2024 11:47 am
3 Chunk Square
3-chunk-square.jpg



I made this junction trying to optimize for the test bench, but i noticed the test bench adds some rails that invalidate the signals, if removed manually , the junction seem to score good , but i don't want to publish my own non-official results.
Looks really nice:)
I'll see if I can do something with the rail placing.
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Re: 3 and 4 way intersections

Post by ManDeJan »

Hi!

I'm new here, I made this 4 way intersection for my space age playthrough, I use 1-2-1 trains but for this thread I tested it with 2-4 trains :). I'm new to trains (previous playthroughs only did belts), this is the first intersection I designed, not sure all the signalling is exactly correct but it seems to run smoothly through the benchmark. I'm happy it fits exactly in a 5 tile cross.


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Factoriointersection
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Re: 3 and 4 way intersections

Post by Factoriointersection »

mmmPI wrote: ↑Tue Oct 29, 2024 11:47 am
3 Chunk Square
3-chunk-square.jpg



I made this junction trying to optimize for the test bench, but i noticed the test bench adds some rails that invalidate the signals, if removed manually , the junction seem to score good , but i don't want to publish my own non-official results.
I figured it out. It's because under the elevated rai there is an open rail. No Idea how I can account for that. I fixed it so that a singel rail wouldn't cause issues, but an open ended rail like that, hard to patch.
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Factoriointersection
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Re: 3 and 4 way intersections

Post by Factoriointersection »

ManDeJan wrote: ↑Tue Oct 29, 2024 6:18 pm Hi!

I'm new here, I made this 4 way intersection for my space age playthrough, I use 1-2-1 trains but for this thread I tested it with 2-4 trains :). I'm new to trains (previous playthroughs only did belts), this is the first intersection I designed, not sure all the signalling is exactly correct but it seems to run smoothly through the benchmark. I'm happy it fits exactly in a 5 tile cross.



Screenshot 2024-10-29 191343.png
Nice=) looks like about score 100 ish. You sure about the name though?
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Locutus123456
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Re: 3 and 4 way intersections

Post by Locutus123456 »

Hi All,

I posted an intersection on Reddit (https://www.reddit.com/r/factorio/comme ... ersection/) and was pointed to this forum.

To be honest at first I did not see the added value of the benchmarking mod. The reason being that this junction does not actually contain same level intersections and by first splitting off traffic that goes in different directions I minimize conflict points. Only if two trains share the same outbound direction they will have to wait for each other. So I, incorrectly reasoned: "what is left to test".

However, running the benchmarking tool I was a bit disappointment in the performance. First, because this signal density is much higher than what I'm used to when playing Factorio, but this was easily fixed. Secondly, this test contains, many trains that simultaneously want to go in the same direction, this will quickly create a traffic jam on the single inbound track.

I then started experimenting with buffering the outbound traffic, as you can see below there is quite some space before the outbound traffic is merged into a single track. It does however feel like cheating a bit, how much buffer can you add while still considering it as two lane traffic?
Screenshot 2024-10-29 204545.png
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Final note: I'm aware that my original design without the buffer lanes has been posted before, I was unaware of this prior work.
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Re: 3 and 4 way intersections

Post by akulen »

I finally improved my previous intersection, adding the last pair of direction/lane pair that was missing.
It can probably be improved on, but at least it makes for a reasonable 4 lane 4 way intersection baseline.
It fits exactly in 6x6 chunks

Blueprint: RHT, Size: 192 x 192, Spacing: 4 tiles, Train length: 2-4
RHT: Set1: 174.09, Set2: 188.80, Set3: 197.20


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Factoriointersection
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Re: 3 and 4 way intersections

Post by Factoriointersection »

akulen wrote: ↑Wed Oct 30, 2024 6:24 am I finally improved my previous intersection, adding the last pair of direction/lane pair that was missing.
It can probably be improved on, but at least it makes for a reasonable 4 lane 4 way intersection baseline.
It fits exactly in 6x6 chunks

Blueprint: RHT, Size: 192 x 192, Spacing: 4 tiles, Train length: 2-4
RHT: Set1: 174.09, Set2: 188.80, Set3: 197.20



StarLoopTest.png
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nice one! added it. You should update and use the latest scenario=)
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Re: 3 and 4 way intersections

Post by Avona »

Frog Eye Intersection: 6 tile (3 spaced), 94x86
https://factoriobin.com/post/wg4eu1
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