"flat oval" meaning in English

{
  "forms": [
    {
      "form": "flat ovals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flat oval (plural flat ovals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "english": "a racetrack in which all segments are either convex or straight",
          "word": "oval"
        },
        {
          "english": "an oval with positive-camber banking, especially over the convex (turn) segments",
          "word": "banked oval"
        }
      ],
      "glosses": [
        "A type of racetrack, where the circuit is not banked to allow for track in cornering, thus missing positive camber needed to transform centrifugal force into normal force and traction. The shape footprint of the oval itself is unrelated to being \"flat\", as it only deals with the banking of the track and not the shape traced out by the track."
      ],
      "id": "en-flat_oval-en-noun-Gyly23fG",
      "links": [
        [
          "racetrack",
          "racetrack#English"
        ],
        [
          "banked",
          "bank#English"
        ],
        [
          "camber",
          "camber#English"
        ]
      ]
    }
  ],
  "word": "flat oval"
}

{
  "coordinate_terms": [
    {
      "english": "a racetrack in which all segments are either convex or straight",
      "word": "oval"
    },
    {
      "english": "an oval with positive-camber banking, especially over the convex (turn) segments",
      "word": "banked oval"
    }
  ],
  "forms": [
    {
      "form": "flat ovals",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "flat oval (plural flat ovals)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "A type of racetrack, where the circuit is not banked to allow for track in cornering, thus missing positive camber needed to transform centrifugal force into normal force and traction. The shape footprint of the oval itself is unrelated to being \"flat\", as it only deals with the banking of the track and not the shape traced out by the track."
      ],
      "links": [
        [
          "racetrack",
          "racetrack#English"
        ],
        [
          "banked",
          "bank#English"
        ],
        [
          "camber",
          "camber#English"
        ]
      ]
    }
  ],
  "word": "flat oval"
}