Google map, coordinates: 43.076 N, 92.809 E
"It seems pretty well established as the Yaerbashi Test Range. It also appears to mostly be a driving school. Probably for large transport trucks or caravans of large trucks, likely military in nature, given the color and size of the trucks parked all over the base (not many other large operations really love olive drab that much). Those weird "glyphs" are lanes for them to stay in as they learn how to handle the trucks. Its really clear in the "glyphs" on the left hand side, as you can see the tire marks curving through the jagged lines, because they can't actually corner like that.
The figure eights everywhere are probably either just for practice at hitting the ones on the course right or for practice in a non-paved environment. You can tell because some are terrible, good ones hit the figure 8 properly, and all have two lines indicative of the tires of the trucks.
That plus the facsimile four lane highways throughout (with included four way stop), and the fake t-intersections, which could doubly be used as practice reversing the trucks into spots accurately.
The rest of the outpost also looks military in nature, you have a single main road leading to a gate/guardhouse with most of the base fenced in (albeit somewhat weakly, but this likely isn't an area of utmost importance), the large square buildings just south of the main training area could be truck bays for storage and repairs, and the rest of the buildings general purpose military buildings for people living and training on post."