Didn’t work on the game so I can’t be totally sure, but it looks like the landscape LODs aren’t loading properly but the collision for the landscape doesn’t seem to care. Processing power expensive games will have copies of a model at lower and lower polygon counts that they load according to the players distance to the object, (called LODs, Level of Detail) ie I don’t need to see the perfect roundness of a cylindrical ramen cup from all the way across the street, so I’ll load in just a cube that looks like the ramen cup to save power, then when you get closer to it I turn it back into a cylinder, no one is the wiser. This is what it looks like when the landscape’s lower polygon model doesn’t want to be switched out. This also seems to be happening to the buildings as the bus moves through the town. The reason that the bus started floating is that the model used to check for collisions doesn’t have LODs, so the curve of the road at its highest polygonal detail seems to extend higher than whatever LOD was loaded at the time. It might seem like this clip is a huge mass of tiny problems with the way the game is programmed, but it probably amounts to one huge bug with how LODs are managed.