{
  "width": 100,
  "height": 60,
  "background": "#f2efe9",
  "features": [
    {
      "type": "linestring",
      "tags": { "feature": "highway_motorway", "cycleway": null, "service": null, "tunnel": null, "bicycle": null, "bridge": null, "construction": null, "highway": "motorway", "foot": null, "horse": null },
      "layers": ["minor-roads-casing", "minor-roads-fill"],
      "zoom": 15
    },
    {
      "type": "linestring",
      "tags": { "feature": "highway_residential", "cycleway": null, "service": null, "tunnel": "", "bicycle": null, "bridge": null, "construction": null, "highway": "residential", "foot": null, "horse": null },
      "layers": ["minor-roads-casing", "minor-roads-fill"],
      "zoom": 15
    },
    {
      "type": "linestring",
      "tags": { "feature": "highway_footway", "cycleway": null, "service": null, "tunnel": null, "bicycle": null, "bridge": null, "construction": null, "highway": "footway", "foot": null, "horse": null },
      "layers": ["minor-roads-casing", "minor-roads-fill"],
      "zoom": 15
    }
  ]
}

{
  "width": 100,
  "height": 60,
  "background": "#f2efe9",
  "features": [
    {
      "type": "linestring",
      "tags": { "feature": "highway_motorway", "cycleway": null, "service": null, "tunnel": null, "bicycle": null, "bridge": null, "construction": null, "highway": "motorway", "foot": null, "horse": null, "tracktype": null },
      "layers": ["roads-casing", "roads-fill"],
      "zoom": 15
    },
    {
      "type": "linestring",
      "tags": { "feature": "highway_residential", "cycleway": null, "service": null, "tunnel": "", "bicycle": null, "bridge": null, "construction": null, "highway": "residential", "foot": null, "horse": null, "tracktype": null },
      "layers": ["roads-casing", "roads-fill"],
      "zoom": 15
    },
    {
      "type": "linestring",
      "tags": { "feature": "highway_footway", "cycleway": null, "service": null, "tunnel": null, "bicycle": null, "bridge": null, "construction": null, "highway": "footway", "foot": null, "horse": null, "tracktype": null },
      "layers": ["roads-casing", "roads-fill"],
      "zoom": 15
    }
  ]
}

Update example for new openstreetmap-carto layer names.
Update example for new openstreetmap-carto layer names.
