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The Original Sunken Wall Collection was created by jdcrozier. I have taken his original assets and redecorated them using Breezes tree assets to give them a more side of the road wild country look. I have assigned these assets custom UI priorities and will show up in the pedestrian paths menu under parks & beautification with custom sleek thumbnails! This Collection Requires 3 Tree assets to function properly.

This collection allows for sunken walls that can be used to contain highways, railways, or anything else! The walls will hide the cliff texture and allow for a very sharp-looking product. These assets do require some playing around with and getting used to but are well worth the trouble!

Tutorials:

Straight Roads and Intersections: http://imgur.com/a/6ajsT
Curved Roads: http://imgur.com/a/hP3Nw
Corners/Water: http://imgur.com/a/aS93v
Hiding the upper road: http://imgur.com/a/CHNH3
On/Off ramps: http://imgur.com/a/i6DSr

Triangle counts are under 50 for straight pieces and are no more than 750 for the curved assets.
Each asset has a custom LOD that is under 100 tris.
Texture sizes are (512x256) and utilize repeating textures.

Stats:
250 per unit cost
25 per unit maintenance
0 per unit entertainment accumulation
0 entertainment radius
0 Workers/Tourists

These mods are helpful and/or necessary for some features:

Terraform Tool: Required to change the terrain height and allow below-grade road construction.
No Pillars: Required to use sunken intersections.
Precision Engineering: Helpful when laying out roads for alignment.
Toggleable Whiteness: Helpful when aligning ploppable assets.