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4 W Freeflow Interchange Pack with TMPE, IMT and NCR

This is my collection of 4-way system interchanges. The pack includes 17 individual interchanges with 15 unique topological designs. They are free-flow AKA conflict-free interchanges, so they have no traffic-lights, merging, splitting or weaving conflicts. As such, they will never jam. They also include NCR, IMT and TMPE settings, so you can just plop and forget.


The interchanges come with IMT, NCR and TMPE settings and if you are using the mods, you can just plop and enjoy beautiful interchanges that never jam.
While NCR and IMT have cosmetic effects, TMPE lane connector is vital for free-flowing functionality.

Because free flow interchanges require that cars enter and exit in specific lanes, you need at least one node before connecting again. However, I recommend at least 3-4 nodes between any highway interchanges/ramps. If you have weaving issues before or after the interchange, you can add more nodes or use individual driving styles or dynamic lane selection features.

I would recommend placing the interchange in relatively flat terrain and smoothening the area after placing if there are sunken roads. Since each map has its own biome, I have not decorated the interchanges with trees or bushes.


When it comes to making interchanges, you have to compromise between footprint and smoothness of roads. You can make very compact interchanges with extreme turns, steep slopes and very low clearance between levels that make you feel like it is a roller coaster. Or, you can make extremely smooth and gentle interchanges that are miles long and you will need to use a lot of lands to make room for the interchange. I have aimed to achieve a healthy compromise between the two where slopes are gentle, curves are smooth enough that cars do not need to slow down and there's 12 m separation between levels; while also ensuring that the you can realistically place them in your city. The size varies from 40x40 to 60x60 units, junction to junction.

I've used the following mods to make the interchanges and I heavily recommend them. You do not need to have them to use the interchange, but you will need NCR, IMT and TMPE to use their settings.

Fine road tools
Fine road anarchy
Node Spacer
Move it
Precision Engineering
Network Multitool
Elektrix's road tools
TMPE (Traffic Manager President Edition)
NCR (Node Controller Renewal)
IMT (Intersection Marking Tool)


The designs I have used for the interchanges have many sources and often different names. Some of the interchanges are used at hundreds of places in real life, some of them are experimental with a few real examples, some of them are inspired by interacting with cities skylines community for years and some are my own design. Of course, 4-way free flow interchanges is an extremely common problem and it's practically impossible to come up with a completely new design for it in the 21st century that no one has ever thought about.

A huge shoutout to modders who have worked hard to make this game even better. I especially thank TMPE team and macsergey for implementing TMPE, IMT and NCR settings for assets. They have personally helped me out to ensure I can save their mod's settings on a workshop asset. I also thank Maxfx for tips and for testing out the interchanges.


I have made a few 5,6,7,8 way interchanges and published some of them, depending on interest I will update them with TMPE, NCR, IMT settings and put them on workshop. I am also thinking about putting some service interchanges and roundabouts which you can just plop and they'll work perfectly without needing to configure. Lastly, I am also open to working with map creators to create highway systems for their map and perhaps publish a collection of interchanges that have unique features and odd angles instead of perfect right angles for highways.

Feel free to give feedback and request any 4-way interchange design that is not included here.