texture detail on planes or other meshes

I'm having a problem with textures on a plane in the distance. How do I keep the original detail even at a distance? For instance if I wanted to create a 2D (or 2.5D) game like GTA2 with small textures but with original pixel detail?

That blurring effect you're experiencing on far away textures is Mip Maps. It's basically a set of lower-res textures (in several sizes, all smaller than the original) created so that when an object is far away - it could be rendered faster using lower-res textures. The idea is that far away objects are so small there's no reason to display the full res texture.

It's pretty simple to get rid of - in the texture import settings - uncheck "Generate Mip Maps".