Midtown Madness 2 HD is a really nice mod made by KingAndy. This mod replaces some of the original textures for the buildings and props of the game with new, higher quality ones. Being an unfinished mod, bugs, unfinished art, or lower-quality additions may be present. It's highly recommended to use this mod with Revisited V5 or Shader Mod 2 Gold since those are finished quality enhancing mods.
Make sure MM2HD is above them in alphabetic order on your game directory so its features aren't replaced.