Route départementale française D27 (78)

Route départementale D27 (78)
Mur Michelin à l'entrée de Rochefort-en-Yvelines sur le tracé déclassé. © Jmlv
Localisation
Pays	France
Département	Yvelines (78)
Caractéristiques actuelles
Itinéraire	Rambouillet - Longvilliers (D906 - D27 (91))
Longueur	15,5 km

Présentation

• La route départementale française D27 (78), ou RD27 (78), est une route départementale située dans le département des Yvelines (78) qui permet de relier Rambouillet à Longvilliers, soit la D906 à la D27 (91) dans l’Essonne (91). Elle est classée « Route internationale » par Michelin.
• Elle permet une liaison efficace de Rambouillet à l’A10, presque intégralement en forêt et ne traversant que très peu de zones habitées. Elle possède une antenne, la D29. Elle est en tronc commun avec les D149 et D988 à Rochefort-en-Yvelines et avant l’ouverture de la déviation complète de cette dernière ville en 1999, la D27 partageait le tracé avec ces routes.
• Elle est issue du Gc27 de Seine-et-Oise, ce qui explique qu'elle conserve le même numéro en Essonne (91) et dans les Yvelines, départements créés en 1968 suite à la partition de la Seine-et-Oise.

Tracé

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Légende de la carte ou du tableau
En jaune	Le tracé actuel de la D27.
En violet	Tronc commun avec les D149 et D988.
En blanc	Ancien tracé partagé avec les D149 et D988 à Rochefort-en-Yvelines.
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.

Plaque Michelin à Clairefontaine-en-Yvelines. © Jmlv

• Yvelines (78) - D27
  • D906 Rambouillet Château
  • La Drouette
  • Clairefontaine-en-Yvelines D29
  • Rochefort-en-Yvelines
  •  Court tronc commun avec la D988.
  •  Court tronc commun avec la D149.
  • Longvilliers
• Essonne (91) - D27

Trafic

• Rambouillet : 5 153 véhicules/jour (2010)
• Clairefontaine-en-Yvelines : 2 833 véhicules/jour (2009)
• Longvilliers : 2 138 véhicules/jour (2010)

Autour de la route

• Rambouillet : la Château et la forêt
•  Parc naturel régional de la Haute-Vallée de Chevreuse