The details, as they are called, are the world's models.
One of the future changes to American Truck Simulator is the addition of Kansas. The addon is still in its early stages of development, so the SCS Software studio has shown not only the game locations, but also the planning for their creation.
The developers provide a selection of screenshots of virtual Kansas buildings in the next release.
Developers use reference pictures of actual buildings when recreating them. For less important structures, researchers use materials.
The developers make sure that the add-on they are using is appropriate. This knowledge will be useful when designing structures that do not resemble real structures. Buildings designed specifically for the add-on should still resemble the real buildings in this region.
This is an interesting story.