That's probably where I messed up, cause mine doesn't look that nice :C I just made a gap, added some 2 lane roads -so it is straight- and then started planting walls here and there xD

Yes, some flattening was involved. I flattened the land, added the walls, and then flattended between the walls to a lower height.

I see. Did you flatten this completely before building?

Except in the middle, where I put a six-lane.

What I did, was I put them every other block.

I like what you did there. You really did a nice job with the on/off ramps. I also like the repetitive use of the overpasses. I didn't use them that much and I regret it.

I use this: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=487703034

Careful though, kind of annoying to build and it takes a lot of money, especially if your land isn't flat.

Amazing, how do you build that?