3 and 4 way intersections

[leftofzen]

Only constraint in building this was that it had to be 3x3 chunks (so 96x96 tiles). 180-degree rotationally symmetric. Prioritises straight-through traffic, with the inner lanes being straight-through exclusive. Bottleneck is the turning lanes and merging, by design of course. Power poles were just to help with grid alignment and don't serve any functional purpose.

04-02-2026, 22-03-04.png (1.14 MiB) Viewed 993 times

[leftofzen]

This turbine design is rotationally symmetric in a 3x3 chunk space, with the 'downside' that not all lanes can go in all directions and there is no turnaround. 90-degree rotationally symmetric. However, throughput is good and I usually build this in my maps with a separate lane-changer on the entrances/exits to this intersection.

04-02-2026, 22-18-08.png (1022.03 KiB) Viewed 984 times

[Oliverfactorio]

Skärmbild 2026-04-24 175031.png (1.3 MiB) Viewed 567 times

Not sure if diagonals are welcome but here is a diagonal crossing converted to straight rail to work with the tool.

[Factoriointersection]

Hey, So I know I havent updated the thread, but I have a new plan. Now I have added all the new intersections that follow the criteria's but not on the forum but rather into the mod. That way you get proper filtering and not this messy forum list.
Check out the updated Testbench. Press the "i" icon and check Global runs. I do plan on making a standalone mod you can use in your normal savefile.
So if you want to submit more intersection now its open again=)

The intersection I excluded either had no BP, too many signals, deadlocked or wasn't a proper 4 or 3 way.

https://mods.factorio.com/mod/Testbenchcontrols