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Submerged highway connection

Submerged highway connection by tobbelobb

I made this intersection to have an easy way to connect my underground higways to the surface road net. It works both as a highway intersection(connecting multiple highways), and as a ramp(connecting highway to 2-lane road). All you have to do is plop it and connect your highways to the underground roundabout.

Pros:
+ Very compact above the surface
+ Easy to plop (It can handle a slight slope)
+ Symmetric

Cons:
- Not the greatest capasity
- Expensive

If you have any tips on how to improve the design, I would love to hear them :)