4-lane to 2-lane junction

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4-lane to 2-lane junction

Postby vanatteveldt » Mon Dec 11, 2017 11:39 pm

I want to upgrade my 'backbone' to 4 lanes (2 each direction) while keeping the rest of the network on 2 lane track. I guess I could take any odd 4-lane intersection and merge/split the ends, but I thought I would try my hand at designing one. I started from the "traditional" junction in the stickied intersections thread, and turned the sideways branches into 2 lane. I also wanted to change the spacing: the sideways branches are spaced 9 apart (leaving room for two rail in between with 2 block spacing, which is my normal distance between stations) and the middle lanes of the 4 lane track are spaced 8 apart (leaving room for a lane changer in between).

Image

Note that not all lanes are connected: the outer tracks do the left turns, the inner track the right turns (it's left hand drive / LHD). So, to allow anywhere-to-anywhere connections I need to place lane changers between junctions.

This is my first real try to design a junction, so far I just copied good designs :). So what I tried to make sure was (1) to have chain signals before each crossing and a normal signal at the exit points; and (2) that traffic that doesn't need to interfere doesn't interfere, i.e. opposing right turns can go simultaneously and the straight lanes in the same direction are all isolated from each other. I think those are the desired properties and that I managed to do this, but all feedback welcome!

image with lane changer and distances
Image

image with rail blocks
Image

Note: the purple block in the center left is actually two blocks. Also note that I couldn't find a way to turn the black block in the center right into two blocks in the current spacing, but I don't think it matters that much since it wouldn't isolate two paths that can be used simultaneously, although it might improve throughput a bit. I wouldn't mind increasing the distance between the inner 4-lane tracks from 8 to 9, but I don't think that would solve it for both directions

blueprint
Code: Select all
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Re: 4-lane to 2-lane junction

Postby SQLek » Tue Dec 12, 2017 9:32 am

In upper right, in the path from bottom to right, one chain signal isn't symmetric... my apologies for my ocd :lol:

Neat design :D
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Re: 4-lane to 2-lane junction

Postby vanatteveldt » Tue Dec 12, 2017 3:21 pm

SQLek wrote:In upper right, in the path from bottom to right, one chain signal isn't symmetric... my apologies for my ocd :lol:


The horror! :D

Thanks for your interest and let me know if you spot any (other) mistakes!
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Re: 4-lane to 2-lane junction

Postby Divaya » Sun Dec 31, 2017 3:44 pm

Oh hey, I'm the deisnger of the traditional intersection and I actually made 4-2 intersection:
Image

Blueprint
Code: Select all
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I like your wide version (and wide 2-lanes) better, though. It would have made upgrading from 2 lane to 4 lane in my save a lot less painful.
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Re: 4-lane to 2-lane junction

Postby vanatteveldt » Mon Jan 01, 2018 10:15 pm

Divaya wrote:Oh hey, I'm the deisnger of the traditional intersection and I actually made 4-2 intersection:
[..]
I like your wide version (and wide 2-lanes) better, though. It would have made upgrading from 2 lane to 4 lane in my save a lot less painful.


Thanks :). Although in that case I should really make the wide 2-lanes one wider, as now it doesn't quite match the distance between inner lanes in the 4-lane track...
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