Hello.. I am always driving around at night in GTA IV. Under you car there is a ugly 64x64 texture that's dark and pixelated. The textures were enhanced up to 1024x1024 for both bikes and cars!
Installation:
Simply copy the lights_occluders.wtd to your [drive]:\Program Files\Rockstar Games\Grand Theft Auto IV\pc\textures
Be sure to create a backup if you wish to restore to the original textures.
Compatible with every version of the game from 1.0.0.0 - 1.0.7.0