Route nationale française 523

Route nationale 523
Plaque Michelin sur la RN523 à Tencin.© G.E.
Localisation
Pays	France
Régions	Auvergne-Rhône-Alpes, Occitanie
Exploitation
Concessionnaire	ASF
Caractéristiques de 1933 à 1973
Itinéraire	Grenoble - Montmélian
Longueur	49,3 km
Caractéristiques actuelles
Itinéraire	Tunnel de Puymorens
Longueur	6 km

Présentation

• La route nationale 523, ou RN523, est une route nationale française, antenne de la RN20, assurant la continuité de cette dernière par le Tunnel de Puymorens.
• Elle a le statut de voie express sur toute sa longueur.
• L'appellation RN523 semble être purement administrative, l'axe étant numéroté en RN20 sur le terrain et sur de très nombreuses cartes.

Historique

Généralités

Plaque de cocher sur la RD2 (future RN523) à Tencin. © G.E.

• Le numéro RN523 était initialement attribué à la route qui relie Grenoble à Montmélian par la rive gauche de l'Isère.
• A sa création, en 1933, elle est définie comme la route de Grenoble à Montmélian par la rive gauche de l'Isère.
• En Isère, elle est issue de voies urbaines de Grenoble (boulevard Gambetta, cours Lafontaine, boulevard Auguste Sembat et boulevard des Alpes) et du chemin de grande communication n° 62, ou Gc62 (38). En Savoie, elle est issue de la route départementale n° 13, ou RD13 (73).
• Elle possédait une annexe, la RN523^A.
• La question de la traversée de Grenoble a été âprement débattue afin d'éviter l'emprunt d'un itinéraire étroit en centre-ville. A la place, un classement de voies urbaines est effectué à l'extérieur du centre historique. Cet itinéraire sera à son tour abandonné en 1971 lorsqu'elle classée dans la voirie nationale la déviation de Saint-Martin-d'Hères (voir ci-après).
• Elle est déclassée en 1973 en D523 en Isère (38) et en D923 dans la Savoie (73).
• La partie Grenobloise de l'ancien tracé de la RN523 (post-1971) a été renommée brièvement en RN87, puis en RN2087, avant d'être déclassée en 2006 en D1087.
• La portion située sur le territoire de Grenoble-Alpes Métropole est exploitée par cette dernière depuis le 1^er janvier 2017.
• Dans les Pyrénées, le Tunnel de Puymorens est mis en service le 21 octobre 1994.

Aménagements

• Déviation de Saint-Martin-d'Hères : début 1949, élargie en 1967 et classée dans la voirie nationale seulement en 1971.
• Rectification le long de l'Isère à Montmélian : 1982, suite à l'effondrement du pont des Molettes lors de la crue d'octobre 1981.

Autour de la route

• Grenoble.
• Massif de Belledonne.

Tracés historiques

Tunnel de Puymorens (actuel)

Chargement de la carte...

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Légende de la carte ou du tableau
En rouge	Tracé actuel.
Pour plus d'informations sur les sources cartographiques, consulter cet article.
La carte ne s'affiche pas ? Merci d'éditer l'article et de le sauvegarder sans aucune modification.

• Ariège (09) - N523 E09
  • N20 N22 N320 L'Hospitalet-près-l'Andorre
  • L'Ariège
  •  Tunnel de Puymorens +  Ligne de partage des eaux entre Océan Atlantique et Mer Méditerranée.
• Pyrénées-Orientales (66) - N523 E09
  • Porté-Puymorens N20 N320

Grenoble - Montmélian (1933 à 1973)

Chargement de la carte...

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class=\"mw-parser-output\"\u003E\u003Cp\u003EGrenoble\n\u003C/p\u003E\u003C/div\u003E","title":"Grenoble\n","link":"","lat":45.1935692952472,"lon":5.723885941758681,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EGrenoble\n\u003C/p\u003E\u003C/div\u003E","title":"Grenoble\n","link":"","lat":45.19231969164072,"lon":5.720423406150303,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EGrenoble\n\u003C/p\u003E\u003C/div\u003E","title":"Grenoble\n","link":"","lat":45.189326,"lon":5.74203,"icon":""},{"text":"\u003Cdiv class=\"mw-parser-output\"\u003E\u003Cp\u003EMontm\u00e9lian\n\u003C/p\u003E\u003C/div\u003E","title":"Montm\u00e9lian\n","link":"","lat":45.497758,"lon":6.044892,"icon":""}]}

Légende de la carte ou du tableau
En rouge	Tracé cédé à la RN87 en 1978.
En jaune	Tracé déclassé en 1973.
En vert	Tracé abandonné en 1971.
En bleu ciel	Tracé initialement envisagé dans Grenoble.
Pour plus d'informations sur les sources cartographiques, consulter cet article.
La carte ne s'affiche pas ? Merci d'éditer l'article et de le sauvegarder sans aucune modification.

• Isère (38) / Grenoble-Alpes Métropole - D523
  • Grenoble
    • D1075 Quartier Hyper-Centre L'Isère D15 (vers D512 D531)
    • Boulevard GambettaD5
    • Université D1090
• Isère (38) / Grenoble-Alpes Métropole - D1087
  • Saint-Martin-d'Hères
    • Le Bidal
    • Les Glairons
    •  ZI de Champ Roman  N87   2 
• Isère (38) / Grenoble-Alpes Métropole - D523
  • Gières
    • Chamandier D524
    • Le Pied de Gières
  • Murianette
    • Murianette Village
    • Le Rivet
  • Domène Prieuré
    • Les Mortes
    • Domène Village D11
    • Les Arnauds
    • Les Contamines
    •   D11^K
• Isère (38) - D523
  • Le Versoud
    • La Masse
    • Étape
    • Les Contamines  Grenoble-Le Versoud
    • Le Versoud Village
    • La Plaine  
    • Pruney
  • Villard-Bonnot Église Circulaire, Musée de la Houille Blanche
    • Cité des Roses
    • Villard-Bonnot Village
    • Cité de Vors
    • Le Grand Carré  
    • Pont de Vinrz Le Vors
    • Cité Sabot
    • D10 D528
  • Froges
    • Brignoud
    •  
    • FrogesVillage
  • Le Champ-près-Froges D250
    • Bas-Champ   D10^A
    • Campalud  
  • La Pierre
    • Fermes du Nan
    • Château Vieux
    • La Perrière
  • Tencin
    • La Tuilerie
    •  
    • Tencin Village Le Merdaret D30
    • Grange des Glairons  
  • Goncelin
    • La Chandelière  
    • Villard-Bozon D29
    • Collège  
    • Goncelin Centre Château, Église D29 D525
    • Grange des Blaches
  • Le Cheylas
    • Les Chaberts  
    • Les Blaches Le Salin  
    • Le Marcieu
    •  
    •  
    • Bacon  
    • La Gare
  • Pontcharra Château Bayard
    • Les Épineys
    • Villard-Noir Pré Châtaigner
    • Les Gayets   D523^B
    • Grinon   D525^B
    • Pontcharra Centre Le Bréda D523^A
    • La Courrerie
• Savoie (73) - D923
  • Laissaud
    • Laissaud Village
    • Chantabord
    • Pré du Riff
  • Les Mollettes
    • Les Mollettes VillageD202
    • Pont des Mollettes Le Coiselan
  • Saint-Hélène-du-Lac
    • La Gare
    •  Alpespace
    •  
  • La Chavanne La Bassée  A43   22  D204
  • L'Isère
  • Montmélian Châteaux, Hôtel de Ville, Pont Morens D1006