This mod adds City Layout with Roundabouts and a Sunken Highway [REMOVE YOUR TRAFFIC] to the Cities Skylines.
Authors description: There’s a 2 lane highway going through to the city and many overpasses over sunken highway.
I can’t guarantee that you won’t be having traffic in your city but this layout works for me.
How to install this mod: download the archive with City Layout with Roundabouts and a Sunken Highway [REMOVE YOUR TRAFFIC] mod, unpack it and transfer files (mod folder or mod.dll) to the folder C:/Users/USER NAME/AppData/Local/Colossal Order/Cities_Skylines/Addons/Mods/
Note! Unpack Assets (assets.crp) to the Assets folder, Maps to the Maps folder and Color Corrections (colorcorrection.crp) to the ColorCorrections folder.