Route nationale française 178 bis

Route nationale 178Bis
La Chapelle-Glain, magnifique borne d'angle recyclée en support pour pluviomètre.© Brice Daviaud
Localisation
Pays	France
Région	Pays de la Loire
Caractéristiques de 1862 à 1973
Itinéraire	Laval - La Regéserie
Longueur	83 km

Présentation

• La route nationale 178^Bis, ou RN178^Bis, est une ancienne route nationale française qui reliait Laval à La Regéserie.

Historique

Généralités

• A sa création, le 10 juillet 1862, elle est définie comme la route de Laval à Nantes par Craon, Pouancé et Ancenis.
• Cet axe a été constitué à partir de plusieurs routes départementales et stratégiques :
  • D1 entre Laval et le Maine-et-Loire.
  • D8 entre la Mayenne et Pouancé.
  • S10 entre Pouancé et La Chapelle-Glain.
  • D13 entre La Chapelle-Glain et Pouillé-les-Côteaux.
• En mars 1967, son tracé est modifié sur environ 1 km dans la traversée de Laval. Il reprend alors une partie du tracé originel de la RN157 qui venait d'être déviée par les boulevards extérieurs au Sud du centre-ville. La section primitive située entre les tracés de l'ancienne et de la nouvelle RN157 est alors reversée directement dans la voirie communale de Laval.
• Suite à la réforme de 1972, la RN178^Bis est démembrée :
  • L'entrée Ouest de Laval (reprise sur la RN157 en 1967) est déclassée en D26. Elle sera déclassée ultérieurement dans la voirie communale.
  • La section comprise entre Laval et Pouancé est intégrée à la nouvelle RN171. Elle sera déclassée en 2006 en D771.
  • La section comprise entre Pouancé et La Regéserie est déclassée en D878.

Aménagements

• Déviation de Saint-Mars-la-Jaille : 1949 au Sud-Est et 1994 au Nord-Est.
• Rectification de la côte du Bois-Joli : 1983.

Tracés historiques

Chargement de la carte...

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Légende de la carte ou du tableau
En rouge	Tracé repris par la RN171 de 1973 à 2006.
En orange	Sections du tracé originel déclassées localement après déviation.
En jaune	Tracé déclassé en 1973.
En violet	Tronc commun avec la RN157 de 1967 à 1973.
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.

Borne de limite départementale entre Maine-et-Loire et Mayenne sur la RN178^Bis. © IGN

• Mayenne (53) - VC
  • D1 D21 D30 D31 D32 D57 D962 Laval Château, Centre Ancien, Nombreux Monuments
• Mayenne (53) - D771
  • D910
  • Le Haut-Chêne
  • La Paillardière
  • Etrogné
  • Cossé-le-Vivien Musée Robert-Tatin D4 D124
  • Craon Halles, Château D22 D25 D25
  • La Vallée L'Uzure
  • Saint-Martin-du-Limet
  • Renazé Le Chéran D110
  •  Forêt de Lourzais
• Maine-et-Loire (49) - D771
  • La Marinière
  • Virebouton
  • Pouancé Château Médiéval, Nombreux Monuments... D6 D771 D775 (Axe Rennes - Angers)
• Maine-et-Loire (49) - D878
  • Etang du Fourneau
  • La Prévière D6
  • Parc de Cornillé
• Loire-Atlantique (44) - D878
  •  Forêt de Juigné
  • Ancien Prieuré de La Primaudière
  • Juigné-des-Moutiers
  • Le Don
  • La Pelterie D2
  • La Chapelle-Glain La Salmonnais D163
  • Château de La Motte-Glain D26
  • Saint-Sulpice-des-Landes Le Vieux-Bourg D21
  • La Gérardière
  • Carbouchet
  • Saint-Mars-la-Jaille L'Erdre Château D33 D319
  • La Meslière
  • La Regéserie D923