Route nationale 170 Panneau Michelin à Daoulas. Localisation Pays France Régions Bretagne, Bourgogne, Ile-de-France Caractéristiques de 1824 à 1974 Itinéraire Quimper - Châteaulin - Landerneau - Brignogan-Plage Longueur 94 km Caractéristiques de 1974 à 1978 Itinéraire Quimper - Châteaulin - Brest Longueur 76 km Caractéristiques de 1978 à 19xx Itinéraire Montceau-les-Mines Longueur 2,5 km Caractéristiques de 1999 à 2006 Itinéraire Argenteuil - Soisy-sous-Montmorency Longueur 6 km
La route nationale 170 , ou RN170 , est une ancienne route nationale française qui a connu diverses affectations au cours du temps.
A sa création, en 1824 , elle est décrite comme la route de Quimper à Lesneven et à la mer près Plounéour . Elle succède alors à la Route impériale 190 .
Dans les années 1970, cet itinéraire originel connaît plusieurs modifications :
La section entre Daoulas et Brignogan-Plage est déclassée en 1973 en D770 .
A la place, on intègre en 1974 à la RN170 des sections des anciens CD33 et CD233 entre Daoulas et Brest qui permettent d'assurer un itinéraire direct entre Quimper et Brest.
Le nouvel itinéraire ainsi formé entre les deux plus importantes villes du Finistère est aménagé progressivement en voie express , de sorte qu'à chaque nouvelle ouverture, l'ancien tracé devient D770 .
Finalement, en 1978 , l'ensemble de la RN170 est intégré à la RN165 Son numéro fut alors réattribué tardivement à la nomenclature de 1978 à une bretelle de la nouvelle N70 de Montceau-les-Mines, CD974 et 57, à Blanzy N70 (Echangeur de Blanzy) .
Puis elle devint une route de la banlieue parisienne, le Boulevard Intercommunal du Parisis reliant Argenteuil à Soisy-sous-Montmorency. Une première section est ouverte le 29 mars 1999 et une deuxième section le 25 janvier 2003. Ce tracé fut déclassé en 2006 . Elle est en voie express sur tout son parcours en Île-de-France.
Tracés historiques D'Argenteuil à Soisy-sur-Montmorency (entre 1999 et 2006) Chargement de la carte...
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La D170 à hauteur d'Eaubonne. Val-d'Oise (95) D170 D909 D170 A15 et D170 (95) : Paris || Cergy-Pontoise
D14 D470 (quart-échangeur)
D170 D109
Montceau-les-Mines (dans les années 1970-1980) Chargement de la carte...
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De Quimper à Brignogan-Plage (de 1824 à 1978) Chargement de la carte...
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Légende de la carte
En rouge Tracé originel, cédé à la RN165 en 1978.
En orange Tracé classé en 1974, cédé à la RN165 en 1978.
En jaune Tracé originel déclassé en 1973.
Modifier
Ajoutée par G.E.
D909 Argenteuil
Voir l'article Route départementale française D170 (95).
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