Route nationale française 780

Route nationale 780
Flèche Michelin à Arzon© Brice Daviaud
Localisation
Pays	France
Région	Bretagne
Caractéristiques de 1933 à 1976
Itinéraire	Le Poteau Rouge - Port-Navalo
Longueur	28,5 km

Présentation

• La route nationale 780, ou RN780, est une ancienne route nationale française qui reliait Le Poteau Rouge (commune de Theix) à Port-Navalo (commune d'Arzon).
• Elle parcourait toute la presqu'île de Rhuys et se terminait à environ 2 km à vol d'oiseau de la RN781 qui parcourait la presqu'île opposée du golfe du Morbihan.

Historique

Généralités

• À sa création en 1933, elle est décrite comme la route de Vannes à Port-Navalo.
• Entièrement située dans le département du Morbihan, elle est issue du chemin de grande communication n° 31, ou Gc31 (56), pour la section comprise entre la RN165 au Poteau Rouge et Saint-Colombier, du chemin de grande communication n° 20, ou Gc20 (56), pour la section comprise entre Saint-Colombier et Arzon, et du chemin vicinal d'intérêt commun n° 98, ou Ic98 (56), entre Arzon et Port-Navalo.
• En 1976, elle a été déclassée en D780 dans le Morbihan (56).

Aménagements

• Cet axe a été quasiment reconstruit sur toute sa longueur avec des caractéristiques réduites (une chaussée, courtes sections à 3 voies, carrefours intégralement à niveau) avec le calendrier suivant :
  • xx xx 1963 : Rectification de Kerbiboul
  • xx xx 1968 : Section Saint-Colombier - Sarzeau-Est
  • xx xx 1968 : Section Sarzeau-Ouest - Le Net-Ouest
  • xx xx 1969 : Section Sarzeau-Est - Sarzeau-Ouest
  • xx xx 1970 : Section Le Net-Ouest - Port-Navalo
  • xx xx 1972 : Section Novalo-Nord - Novalo-Sud
  • xx xx 1972 : Demi-diffuseur du Poteau-Rouge (RN165)
  • xx xx 1975 : Section Le Poteau-Rouge - Novalo-Nord
  • 25 06 1976 : Section Novalo-Sud - Saint-Colombier
  • xx xx 1979 : Diffuseur de Sarzeau-Est et créneau de dépassement
• Depuis cette époque, les investissements sur cet axe très fréquenté sont des plus réduits. Seuls des carrefours giratoires sont systématiquement implantés au croisement des grandes intersections. Ces aménagements limités contribuent à sécuriser ponctuellement l'itinéraire au détriment de sa fluidité et des temps de parcours.

Autour de la route

• Golfe du Morbihan
• Presqu'île de Rhuys

Tracé historique

Chargement de la carte...

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Légende de la carte ou du tableau
En rouge	Tracé déclassé en 1973.
En jaune	Ancien tracé à Saint-Colombier déclassé en 1970.
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.

• Morbihan (56) - D780
  • Theix-Noyalo
    •  N165 Le Poteau Rouge
    • Ruisseau de l'Étang de Bonnervo
    •  
    •  
• Morbihan (56) - D195
  • Theix-Noyalo Kerentréh D7
• Morbihan (56) - D7
  • Theix-Noyalo
    • Le Pont de Noyalo Étang de Noyalo
    • Noyalo Église Sainte-Anne D7
• Morbihan (56) - D780
  • Le Hézo (Hezoù) Lezuis
• Morbihan (56) - D310
  • Le Hézo (Hezoù) La Villeneuve
  • Saint-Armel (Sant-Armael)
    • Saint-Armel
    • Bel-Air
• Morbihan (56) - D780
  • Sarzeau (Sarzhav)
    • Saint-Colombier D20
    • Château de Kerlévenan
    •  
    • Sarzeau Château de Suscinio et Nombreux Monuments
    •  
    • Château de Coët-Ihuel
    • Menhir de Largueven
  • Saint-Gildas-de-Rhuys (Lok-Weltaz)
    •   Mégalithes
    • Le Net
    • Menhir
  • Arzon
    • Tumiac
    • Arzon Église, Mégalithes
    • Port-Navalo Golfe du Morbihan