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ROUNDABOUT without blocking turn right

https://forums.factorio.com/viewtopic.php?f=194&t=105361

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ROUNDABOUT without blocking turn right

Posted: Sat Feb 25, 2023 4:15 am
by datarza
I have played a little with `ROUNDABOUT SAFE` intersection from viewtopic.php?f=194&t=46855.
This intersection has a huge issue - when train turn to right, then whole intersection will be blocked. Probably the following plan can solve this problem (if no one has posted something similar):
Screenshot 2023-02-24 230615.png
Screenshot 2023-02-24 230615.png (2.86 MiB) Viewed 2875 times

Re: ROUNDABOUT without blocking turn right

Posted: Sat Feb 25, 2023 7:07 am
by SoShootMe
See 3 and 4 way intersections. I think your design is equivalent to "Roundabout+Straights" with the addition of the extra left-turn chords. These add that when a train is turning right, a train from its left can also turn left, so it should perform better; I'm not sure how much though. You can use the Testbench for 3/4way intersections to compare.

Re: ROUNDABOUT without blocking turn right

Posted: Sat Feb 25, 2023 6:11 pm
by datarza
I have found an intersection that looks the same and just wandering if it can be compared to understand what intersection is better from these two options:
render-5ca84b4bceeff34b.jpg
render-5ca84b4bceeff34b.jpg (166.48 KiB) Viewed 2798 times

Re: ROUNDABOUT without blocking turn right

Posted: Sat Feb 25, 2023 8:06 pm
by FuryoftheStars
The best way to test them is to use the testbench SoShootMe linked.

Re: ROUNDABOUT without blocking turn right

Posted: Sun Feb 26, 2023 9:40 am
by datarza
FuryoftheStars wrote: ↑
Sat Feb 25, 2023 8:06 pm
 The best way to test them is to use the testbench SoShootMe linked.
I understand, but it is impossible for me. I have downloaded the mod, added blueprint, have read the description, but have no idea how does it works and how to clarify the results. Anyway, thank you.

Re: ROUNDABOUT without blocking turn right

Posted: Tue Aug 15, 2023 4:24 pm
by Premu
Hm, I wonder if the straight lines even add anything useful to the junction. For me they make it just more complicated. My roundabout solution looks like that:

Image

It allows either four trains to turn right, two trains from opposite directions to pass or one train turning left and one train turning right in the opposite path.

The other examples above might provide two different paths for a train to go in one direction, but once one is chosen the other is blocked anyway. So the throughput seems to be the same...

The only advantage might be the slightly shorter way for a train going straight - but that's a very minor benefit for a lot more headache and lot more rails to build this junction.

Re: ROUNDABOUT without blocking turn right

Posted: Tue Aug 15, 2023 5:38 pm
by SoShootMe
Premu wrote: ↑
Tue Aug 15, 2023 4:24 pm
 Hm, I wonder if the straight lines even add anything useful to the junction. For me they make it just more complicated.
They are definitely more complicated, but (aside from possible performance differences which are also affected by other factors) three benefits spring to mind:
  1. If you have built a straight run of track (eg out to some remote ore patch), you can "add" a junction (eg to another ore patch you later decide to claim) without having to remove any existing rails.
  2. As a personal preference, it looks strange to me seeing fast-moving trains "wiggle" around junctions, especially when they are not turning (which is useful in the sense that it stops that, at least partially).
  3. Rather minor(!), but as you mentioned it is slightly shorter for trains passing straight across.

Re: ROUNDABOUT without blocking turn right

Posted: Sun Nov 26, 2023 3:13 am
by datarza
I have modified ROUNDABOUT for four rails (I do not know if it was invented before).

These features are perfect for city blocks:

1. Two independant rails in both directions, four rails in total from each size
2. U-turn for both rails
3. Changing the rail in the same direction, right to left, left to right, top to bottom, bottom to top - killer feature
4. Prety small size for four rails intesection with u-turn and changing the rail features
5. Stackable roboports
Screenshot.png
Screenshot.png (1.76 MiB) Viewed 1105 times
It will be good, if somebody can test the performance for this blueprint.




Also, there is a version with bigger outbound rail path which is preferable for cityblocks. Here can be attached enter/exist which is red arrows where blue arrows are general rails.
cityblock.png
cityblock.png (2.51 MiB) Viewed 1150 times

Re: ROUNDABOUT without blocking turn right

Posted: Sun Nov 26, 2023 6:06 am
by datarza
Premu wrote: ↑
Tue Aug 15, 2023 4:24 pm
 The only advantage might be the slightly shorter way for a train going straight - but that's a very minor benefit for a lot more headache and lot more rails to build this junction.
Response to your question:

Score of Roundabout+Straights is 29
Score of Roundabout is 28

Source: viewtopic.php?f=194&t=100614

You build rails once, but trains use it over 9000 times, also it can be combined with already placed rails without changing, jsut put intersection over existing rails:
sfsdfsd8.png
sfsdfsd8.png (3.04 MiB) Viewed 1142 times
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