Openstreetmap-carto style with Tilemill - unknown black line in streets

Question

There is an unknown black line in the center of about 80% streets. I have been adjusting line-widths and switching off and on every line layer for hours to no avail.

I am using the latest version of TileMill with the latest openstreetmap-carto style and postgresql. I posted an image below for an example of the black lines that are in the center of the roads. The export looks terrible with these black lines present. I searched for a "road-centerline" style but there were none present that I could find.

---

I narrowed it down to the layer it is on, #roads-text-name. I'm having an issue though trying to figure out which styling is causing the black lines.

    roads-text-name {
  [highway = 'motorway'],
  [highway = 'trunk'],
  [highway = 'primary'] {
    [zoom >= 13] {
      text-name: "[name]";
      text-size: 8;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-face-name: @book-fonts;
      [tunnel = 'no'] {
        text-halo-radius: 1;
        [highway = 'motorway'] { text-halo-fill: @motorway-fill; }
        [highway = 'trunk'] { text-halo-fill: @trunk-fill; }
        [highway = 'primary'] { text-halo-fill: @primary-fill; }
      }
    }
    [zoom >= 14] {
      text-size: 9;
    }
    [zoom >= 15] {
      text-size: 10;
    }
    [zoom >= 17] {
      text-size: 11;
    }
  }
  [highway = 'secondary'] {
    [zoom >= 13] {
      text-name: "[name]";
      text-size: 8;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-face-name: @book-fonts;
      text-halo-radius: 1;
      text-halo-fill: @secondary-fill; 
    }
    [zoom >= 14] {
      text-size: 9;
    }
    [zoom >= 15] {
      text-size: 10;
    }
    [zoom >= 17] {
      text-size: 11;
    }
  }
  [highway = 'tertiary'],
  [highway = 'tertiary_link'] {
    [zoom >= 14] {
      text-name: "[name]";
      text-size: 9;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-face-name: @book-fonts;
      text-halo-radius: 1;
      text-halo-fill: @tertiary-fill;
    }
    [zoom >= 17] {
      text-size: 11;
    }
  }
  [highway = 'proposed'] {
    [zoom >= 15] {
      text-name: "[name]";
      text-size: 9;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-halo-radius: 1;
      text-halo-fill: rgba(255,255,255,0.6);
      text-face-name: @book-fonts;
      text-opacity: 0.3;
    }
    [zoom >= 17] {
      text-size: 11;
    }
  }
  [highway = 'construction'] {
    [int_construction_minor = 'no'][zoom >= 13],
    [int_construction_minor = 'yes'][zoom >= 14] {
      text-name: "[name]";
      text-size: 9;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-halo-radius: 1;
      text-halo-fill: rgba(255,255,255,0.6);
      text-face-name: @book-fonts;
      [zoom >= 17] {
        text-size: 11;
      }
    }
  }
  [highway = 'residential'],
  [highway = 'unclassified'],
  [highway = 'road'] {
    [zoom >= 15] {
      text-name: "[name]";
      text-size: 8;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-halo-radius: 1;
      text-halo-fill: @residential-fill;
      text-face-name: @book-fonts;
    }
    [zoom >= 16] {
      text-size: 9;
    }
    [zoom >= 17] {
      text-size: 11;
      text-spacing: 400;
    }
  }

  [highway = 'raceway'],
  [highway = 'service'] {
    [zoom >= 16] {
      text-name: "[name]";
      text-size: 9;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-halo-radius: 1;
      [highway = 'raceway'] { text-halo-fill: @raceway-fill; }
      [highway = 'service'] { text-halo-fill: @service-fill; }
      text-face-name: @book-fonts;
    }
    [zoom >= 17] {
      text-size: 11;
    }
  }

  [highway = 'living_street'],
  [highway = 'pedestrian'] {
    [zoom >= 15] {
      text-name: "[name]";
      text-size: 8;
      text-fill: black;
      text-spacing: 300;
      text-clip: false;
      text-placement: line;
      text-halo-radius: 1;
      [highway = 'living_street'] { text-halo-fill: @living-street-fill; }
      [highway = 'pedestrian'] { text-halo-fill: @pedestrian-fill; }
      text-face-name: @book-fonts;
    }
    [zoom >= 16] {
      text-size: 9;
    }
    [zoom >= 17] {
      text-size: 11;
    }
  }
}

Answer 1

You might find posting on the OpenStreetMap Carto issue tracker helpful. Most of the developers have moved from Tilemill to Kosmtik, but both should work fine with the style, and because both use Mapnik and carto, both should reproduce the same bugs.

If turning off the roads-text-name layer fixes it, that is odd.

I would first update to the latest OpenStreetMap Carto version, as the roads styling has been significantly changed. It's also worth double-checking that turning off the layer is the only change that you did, because I see nothing in the code you posted or the current code that would cause carto to generate a linesymbolizer, which is what would draw a line like that.

Answer 2

Without seeing all the mss, it's difficult to tell. But how about looking at this from a different angle? Rather than black lines, do you think the roads have thick yellow casing? Are there casing rules for these types of roads? See "Compound line styles" on https://www.mapbox.com/tilemill/docs/guides/styling-lines/