"左側通行" meaning in Japanese

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "左側",
        "3": "通行",
        "sort": "ひだりがわつうこう",
        "t1": "left side",
        "t2": "passage"
      },
      "expansion": "左側 (“left side”) + 通行 (“passage”)",
      "name": "compound"
    }
  ],
  "etymology_text": "左側 (“left side”) + 通行 (“passage”)",
  "forms": [
    {
      "form": "左側通行",
      "ruby": [
        [
          "左",
          "ひだり"
        ],
        [
          "側",
          "がわ"
        ],
        [
          "通",
          "つう"
        ],
        [
          "行",
          "こう"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
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      "form": "hidarigawatsūkō",
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      ]
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  ],
  "head_templates": [
    {
      "args": {
        "1": "ひだりがわつうこう"
      },
      "expansion": "左(ひだり)側(がわ)通(つう)行(こう) • (hidarigawatsūkō)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
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          "kind": "other",
          "name": "Japanese entries with incorrect language header",
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      ],
      "glosses": [
        "Keep Left, a message on a sign indicating that travelers should keep to the left, especially drivers or walkers"
      ],
      "id": "en-左側通行-ja-noun-E3xaFySX"
    }
  ],
  "word": "左側通行"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ja",
        "2": "左側",
        "3": "通行",
        "sort": "ひだりがわつうこう",
        "t1": "left side",
        "t2": "passage"
      },
      "expansion": "左側 (“left side”) + 通行 (“passage”)",
      "name": "compound"
    }
  ],
  "etymology_text": "左側 (“left side”) + 通行 (“passage”)",
  "forms": [
    {
      "form": "左側通行",
      "ruby": [
        [
          "左",
          "ひだり"
        ],
        [
          "側",
          "がわ"
        ],
        [
          "通",
          "つう"
        ],
        [
          "行",
          "こう"
        ]
      ],
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    },
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      "form": "hidarigawatsūkō",
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  "head_templates": [
    {
      "args": {
        "1": "ひだりがわつうこう"
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      "expansion": "左(ひだり)側(がわ)通(つう)行(こう) • (hidarigawatsūkō)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
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        "Japanese terms spelled with fourth grade kanji",
        "Japanese terms spelled with second grade kanji",
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      "glosses": [
        "Keep Left, a message on a sign indicating that travelers should keep to the left, especially drivers or walkers"
      ]
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  "word": "左側通行"
}

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  "path": [
    "左側通行"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "左側通行",
  "trace": ""
}