"chicken bus" meaning in English

{
  "etymology_text": "The word chicken may refer to the fact that the buses are often crammed with passengers not unlike a truck load of chickens, or to the fact that Central Americans occasionally transport live animals on such buses.",
  "forms": [
    {
      "form": "chicken buses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "+"
      },
      "expansion": "chicken bus (plural chicken buses)",
      "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Transport",
          "orig": "en:Transport",
          "parents": [
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a bus in Central America"
      ],
      "id": "en-chicken_bus-en-noun-DQlaFZN~",
      "links": [
        [
          "bus",
          "bus"
        ],
        [
          "Central America",
          "Central America"
        ]
      ],
      "wikipedia": [
        "Bus transport in Central America"
      ]
    }
  ],
  "word": "chicken bus"
}

{
  "etymology_text": "The word chicken may refer to the fact that the buses are often crammed with passengers not unlike a truck load of chickens, or to the fact that Central Americans occasionally transport live animals on such buses.",
  "forms": [
    {
      "form": "chicken buses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "+"
      },
      "expansion": "chicken bus (plural chicken buses)",
      "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",
        "en:Transport"
      ],
      "glosses": [
        "a bus in Central America"
      ],
      "links": [
        [
          "bus",
          "bus"
        ],
        [
          "Central America",
          "Central America"
        ]
      ],
      "wikipedia": [
        "Bus transport in Central America"
      ]
    }
  ],
  "word": "chicken bus"
}