"panneau à message variable" meaning in Français

{
  "abbreviation": [
    {
      "word": "PMV"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "Compositions en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Néologismes recommandés en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Traductions en allemand",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Traductions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "À en français",
      "orig": "à en français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Locutioncomposée de panneau, message et variable."
  ],
  "forms": [
    {
      "form": "panneaux à message variable",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en français du transport aérien",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Lexique en français du transport terrestre",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Panneau de signalisation comportant un dispositif télécommandé permettant d'afficher des messages rapidement modifiables."
      ],
      "id": "fr-panneau_à_message_variable-fr-noun-ZXpH2Z4u",
      "raw_tags": [
        "Transport aérien",
        "Transport terrestre"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\pa.no a mɛ.saʒ va.ʁjabl\\"
    },
    {
      "audio": "LL-Q150 (fra)-Jérémy-Günther-Heinz Jähnick-panneau à message variable.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/LL-Q150_(fra)-Jérémy-Günther-Heinz_Jähnick-panneau_à_message_variable.wav/LL-Q150_(fra)-Jérémy-Günther-Heinz_Jähnick-panneau_à_message_variable.wav.mp3",
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      "raw_tags": [
        "Somain (France)"
      ],
      "wav_url": "https://commons.wikimedia.org/wiki/Special:FilePath/LL-Q150 (fra)-Jérémy-Günther-Heinz Jähnick-panneau à message variable.wav"
    }
  ],
  "tags": [
    "masculine"
  ],
  "translations": [
    {
      "lang": "Allemand",
      "lang_code": "de",
      "tags": [
        "feminine"
      ],
      "word": "Überkopfanzeige"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "variable message sign"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "VMS"
    }
  ],
  "word": "panneau à message variable"
}

{
  "abbreviation": [
    {
      "word": "PMV"
    }
  ],
  "categories": [
    "Compositions en français",
    "Locutions nominales en français",
    "Néologismes recommandés en français",
    "Traductions en allemand",
    "Traductions en anglais",
    "français",
    "à en français"
  ],
  "etymology_texts": [
    "Locutioncomposée de panneau, message et variable."
  ],
  "forms": [
    {
      "form": "panneaux à message variable",
      "tags": [
        "plural"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        "Lexique en français du transport aérien",
        "Lexique en français du transport terrestre"
      ],
      "glosses": [
        "Panneau de signalisation comportant un dispositif télécommandé permettant d'afficher des messages rapidement modifiables."
      ],
      "raw_tags": [
        "Transport aérien",
        "Transport terrestre"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\pa.no a mɛ.saʒ va.ʁjabl\\"
    },
    {
      "audio": "LL-Q150 (fra)-Jérémy-Günther-Heinz Jähnick-panneau à message variable.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/LL-Q150_(fra)-Jérémy-Günther-Heinz_Jähnick-panneau_à_message_variable.wav/LL-Q150_(fra)-Jérémy-Günther-Heinz_Jähnick-panneau_à_message_variable.wav.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/c/c9/LL-Q150_(fra)-Jérémy-Günther-Heinz_Jähnick-panneau_à_message_variable.wav/LL-Q150_(fra)-Jérémy-Günther-Heinz_Jähnick-panneau_à_message_variable.wav.ogg",
      "raw_tags": [
        "Somain (France)"
      ],
      "wav_url": "https://commons.wikimedia.org/wiki/Special:FilePath/LL-Q150 (fra)-Jérémy-Günther-Heinz Jähnick-panneau à message variable.wav"
    }
  ],
  "tags": [
    "masculine"
  ],
  "translations": [
    {
      "lang": "Allemand",
      "lang_code": "de",
      "tags": [
        "feminine"
      ],
      "word": "Überkopfanzeige"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "variable message sign"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "VMS"
    }
  ],
  "word": "panneau à message variable"
}