"curb extension" meaning in English

{
  "forms": [
    {
      "form": "curb extensions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "curb extension (plural curb extensions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Traffic engineering",
          "orig": "en:Traffic engineering",
          "parents": [
            "Engineering",
            "Road transport",
            "Applied sciences",
            "Technology",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A traffic calming measure that widens the sidewalk for a short distance."
      ],
      "id": "en-curb_extension-en-noun-o2sHn613",
      "links": [
        [
          "traffic calming",
          "traffic calming"
        ],
        [
          "sidewalk",
          "sidewalk"
        ]
      ],
      "raw_glosses": [
        "(traffic engineering) A traffic calming measure that widens the sidewalk for a short distance."
      ],
      "synonyms": [
        {
          "word": "curb bump-out"
        },
        {
          "word": "bulb-out"
        }
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences",
        "traffic",
        "transport"
      ],
      "wikipedia": [
        "curb extension"
      ]
    }
  ],
  "word": "curb extension"
}

{
  "forms": [
    {
      "form": "curb extensions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "curb extension (plural curb extensions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "en:Traffic engineering"
      ],
      "glosses": [
        "A traffic calming measure that widens the sidewalk for a short distance."
      ],
      "links": [
        [
          "traffic calming",
          "traffic calming"
        ],
        [
          "sidewalk",
          "sidewalk"
        ]
      ],
      "raw_glosses": [
        "(traffic engineering) A traffic calming measure that widens the sidewalk for a short distance."
      ],
      "synonyms": [
        {
          "word": "curb bump-out"
        },
        {
          "word": "bulb-out"
        }
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "physical-sciences",
        "traffic",
        "transport"
      ],
      "wikipedia": [
        "curb extension"
      ]
    }
  ],
  "word": "curb extension"
}