41C### [at] yahoocom...
> This is the code I've tryed and rising the "Cannot layer over a patterned
> texture" error.

This is a limitation of layered textures.
Two solutions:
- add a road mask to your material_map. If you have already defined zones 
for water etc. you can have another for roads.
- use a texture_map statement and a mask for roads, and then have something 
like this:
texture{
    image_pattern{png "road_mask"}
    texture_map{
        [0 T_Road]
        [1 T_Other]
    }
}


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