Mur d'isolation phonique

part=bottom_left,facing=east,z_align=center part=bottom_left,facing=east,z_align=negative part=bottom_left,facing=east,z_align=positive part=bottom_left,facing=north,z_align=center part=bottom_left,facing=north,z_align=negative part=bottom_left,facing=north,z_align=positive part=bottom_left,facing=south,z_align=center part=bottom_left,facing=south,z_align=negative part=bottom_left,facing=south,z_align=positive part=bottom_left,facing=west,z_align=center part=bottom_left,facing=west,z_align=negative part=bottom_left,facing=west,z_align=positive part=bottom_right,facing=east,z_align=center part=bottom_right,facing=east,z_align=negative part=bottom_right,facing=east,z_align=positive part=bottom_right,facing=north,z_align=center part=bottom_right,facing=north,z_align=negative part=bottom_right,facing=north,z_align=positive part=bottom_right,facing=south,z_align=center part=bottom_right,facing=south,z_align=negative part=bottom_right,facing=south,z_align=positive part=bottom_right,facing=west,z_align=center part=bottom_right,facing=west,z_align=negative part=bottom_right,facing=west,z_align=positive part=middle_left,facing=east,z_align=center part=middle_left,facing=east,z_align=negative part=middle_left,facing=east,z_align=positive part=middle_left,facing=north,z_align=center part=middle_left,facing=north,z_align=negative part=middle_left,facing=north,z_align=positive part=middle_left,facing=south,z_align=center part=middle_left,facing=south,z_align=negative part=middle_left,facing=south,z_align=positive part=middle_left,facing=west,z_align=center part=middle_left,facing=west,z_align=negative part=middle_left,facing=west,z_align=positive part=middle_right,facing=east,z_align=center part=middle_right,facing=east,z_align=negative part=middle_right,facing=east,z_align=positive part=middle_right,facing=north,z_align=center part=middle_right,facing=north,z_align=negative part=middle_right,facing=north,z_align=positive part=middle_right,facing=south,z_align=center part=middle_right,facing=south,z_align=negative part=middle_right,facing=south,z_align=positive part=middle_right,facing=west,z_align=center part=middle_right,facing=west,z_align=negative part=middle_right,facing=west,z_align=positive part=top_left,facing=east,z_align=center part=top_left,facing=east,z_align=negative part=top_left,facing=east,z_align=positive part=top_left,facing=north,z_align=center part=top_left,facing=north,z_align=negative part=top_left,facing=north,z_align=positive part=top_left,facing=south,z_align=center part=top_left,facing=south,z_align=negative part=top_left,facing=south,z_align=positive part=top_left,facing=west,z_align=center part=top_left,facing=west,z_align=negative part=top_left,facing=west,z_align=positive part=top_right,facing=east,z_align=center part=top_right,facing=east,z_align=negative part=top_right,facing=east,z_align=positive part=top_right,facing=north,z_align=center part=top_right,facing=north,z_align=negative part=top_right,facing=north,z_align=positive part=top_right,facing=south,z_align=center part=top_right,facing=south,z_align=negative part=top_right,facing=south,z_align=positive part=top_right,facing=west,z_align=center part=top_right,facing=west,z_align=negative part=top_right,facing=west,z_align=positive