I have uninstalled my sim and gsx a couple of times and nothing has changed. Perhaps it is the compression of Directx 11?
As I've said, I don't see anything particularly wrong with your screenshot.
Yes, it's a known fact that DDS compression can look bad, especially at night, and the effect might be more/less noticeable, depending on your monitor calibration, but it will never be perfect, if you open the actual texture with a graphic program, it doesn't look like that.