I would like to make a multi layered road texture. I've a jpeg image for the
background and i tried to put some tires ground tracks. In order to do
that, i used a gradient but there is an artefact (on the bottom of the
image) and i don't know how to deal with it.

#declare P_Road = pigment {image_map {jpeg ".texturesroad.jpg"} rotate
<270,0,0>};

#declare TextureRoad = texture{
                            gradient z
                            turbulence 0.05
                            lambda 1.5
                            omega 0.1
                            octaves 5
                            texture_map {
                              [0.0  P_Road]
                              [0.3  pigment{rgb <0.1,0.1,0.1>}]
                              [0.5  P_Road]
                              [0.7  pigment{rgb <0.1,0.1,0.1>}]
                              [1.0  P_Road]
                            }
                            frequency 0.25
              }

Thanks for your help.

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