Route nationale française 172

Route nationale 172
Plaque Michelin sur la RN172.© Lloyd_cf
Localisation
Pays	France
Région	Normandie
Caractéristiques de 1824 à 1973
Itinéraire	Coutances - Saint-Lô - Bayeux
Longueur	63,2 km
Caractéristiques de 1982 à 2006
Itinéraire	Rocade Sud-Est de Saint-Lô
Longueur	2,5 km

Présentation

• La route nationale 172, ou RN172, est une ancienne route nationale française qui a connu deux parcours très voisins.

Historique

Généralités

• A sa création, en 1824, elle est définie comme la route de Granville à Bayeux. Elle s'embranche à Coutances, sur la route précédente, n° 171. A l'origine, elle reliait donc Coutances à Bayeux, via Saint-Lô. Elle succède alors à la Route impériale 192.
• Suite à la réforme de 1972, cet itinéraire a été intégralement déclassé en D972.
• Par la suite, le numéro a été réattribué à la Rocade Sud-Est de Saint-Lô. Cet itinéraire en impasse dénommé route de la R.N. 174 (Saint-Lô-Sud) à la R.D. 972 (Sainte-Croix) a été mis en service en 1982 et 1987. Il a été déclassé à son tour en 2005 en D972.

Construction

• Rectification de Saint-Lô : 1839 et 1848 (réparations).
• Rectification de Bérigny : 1849.

Aménagements

• Déviation Nord de Coutances : 1997.
• Suppression du passage à niveau de Saint-Lô : 1954.
• Déviation de Bérigny : 1977 (par reprise du tracé historique rectifié au XIX^e siècle), dénivellation du carrefour avec la D95 en 1996.
• Déviation de Subles : 17 mai 2005.
• Déviation de Saint-Loup-Hors : 1980.
• By-pass de Bayeux : 18 juin 1944, viabilisé en 1954.

Tracés historiques

Chargement de la carte...

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Légende de la carte ou du tableau
En rouge	Rocade Sud-Est de Saint-Lô déclassée en 2006.
En orange	Tracé originel à Saint-Lô et Bayeux rectifié dans les années 1950.
En jaune	Tracé déclassé en 1973.
En bleu ciel	Tracé originel rectifié au XIXe siècle.
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.

Rocade Sud-Est de Saint-Lô (avant 2006)

• Manche (50) - D972
  • D972 Z.A.C. Delta
  • D11
  • Z.A.C. La Chevalerie  N174 D974
  •   D28
  •    N174 D999

Bayeux - Coutances (avant 1973)

Plaque Michelin à Bayeux. © Jmlv

• Manche (50) - D972^E3
  • Cathédrale, Nombreux Monuments D2 D44 D971 D971^E3 Coutances
• Manche (50) - D972
  • La Chapelle
  • Le Neufbourg
  • La Fosse
  • Le Poteau
  • D53
  • La Saulnerie D53
  • La Terrette
  • Saint-Gilles
  • Agneaux  N174 D900
  • Saint-Lô La Vire Remparts, Centre Ancien, Nombreux Monuments... D6 D11 D28 D974 D999
  • Sainte-Croix
  • Le Calvaire
  • La Croix-Rouge
  • Bérigny L'Elle
• Calvados (14) - D572
  • La Malbrèche
  • L'Embranchement
  •  Forêt de Cerisy D10 D13
  • Vaubadon
  • La Tuilerie
  • Noron-la-Poterie
  • Agy
  • Subles La Drôme
  • Saint-Loup-Hors  N13
  • D67
  • Bayeux Tapisserie, Cathédrale et Centre Historique D5 D5^A D6 D12 D516 D613