Hmm, what would happen if you'd zoom in your texture in photoshop as much as it is zoomed in 3ds Max? I guess it wouldn't look that sharp anymore, right? You shouldn't use unique textures for big flat areas, like road, square or brick wall, it will never look sharp, even 16K resolution won't be enough. Use tiled texture for asphalt and add unique dirt texture on top to mask repetition.