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Folded Diamond Interchange [Vanilla]
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Assets: Intersection
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Mar 15, 2020 @ 4:38pm
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me22ca
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Folded Diamond Interchange [Vanilla]

Description
This pushes the junction to between the highways, for to reduce the impact on the surrounding road network.

The 4-lane road in the middle separates left- from right-turn traffic. Similarly, the 6-lane service road means they can all have a dedicated direction. If you feel like customising the traffic light, set it up in 3 phases, like you would a SPUI[www.fhwa.dot.gov]: (1) Cross street continuing straight (2) Off-ramps turning onto cross street (3) Cross street turning onto on-ramps.

As usual, downgrade the overpasses to two-lane highways for Lane Mathemetics™ if you have the Mass Transit DLC or the Network Extensions 2 mod (or anything else with smaller highways).

You can also make it look a bit better by tweaking the road choices. For example, have the ramps go to a 2+2 or 2+1 national road instead of the medium road.

(by me22ca)
3 Comments
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codewitch Jun 22, 2020 @ 10:56am 
I'm going to create an elevated version, give it a try with the settings suggested in the TM:PE and the ones I mentioned. Perhaps in a collector/express system this would be more optimal, but without dedicated express lanes this is difficult to setup in CSL since it requires a completely separate road, not just a median or jersey barrier.
me22ca  [author] Jun 22, 2020 @ 10:48am 
@asterisk11231 Thanks for giving it a try! This one is definitely a bit more compact than would probably be optimal for traffic, but if more space is available then a different interchange would probably be a better choice. IIRC for me the TMPE setup really helped once it started to get a bit of traffic; otherwise it could back up onto the highway fairly badly.

I've started to prefer my large Dogbone , when I leave enough space for it.
codewitch Jun 22, 2020 @ 9:33am 
The overpasses look a little ugly, and the on/off ramps are prone to traffic problems for many miles of highway. I usually convert this to an elevated one - but sometimes it's a bit of work to do so. I'm feeling mixed on this one.

I'll try the traffic light (TM:PE), and using 2+1 national highways (NeXT2) with right turn on red (TM:PE) to see if it helps, but compared to a diverging diamond interchange, I think it's too small to have the right properties for CSL.

Perhaps if it was elevated (as I usually use this as a service interchange for an elevated highway running by/thru my city) you could use a roundabout instead of left turns, keeping it as free-flowing as possible. I might try that in the asset editor.

Overall - I think the main issue is the size for CSL math (vs real math/traffic/merging/zippering).

Your thoughts?