La route nationale 2, ou RN2, est une route nationale française qui relie la ville de Paris à la frontière belge, via Soissons, Laon et Maubeuge. C'est une des rares routes nationales à n'avoir jamais subi de déclassements ni de changements de trajets majeurs.
Il s'agit, dès sa création en 1824, de la route de Paris à Maubeuge et à Bruxelles, par Mons. Elle succède alors à la route impériale 2.
Non dédoublée par une autoroute, la RN2 est aménagée progressivement en voie express sur les sections les plus chargées.
Le tracé de la RN2 a été coupé en 1970 lors de la création de l'aéroport Charles de Gaulle, entre Le Bourget et Dammartin-en-Goële. L'ancien tracé qui passait par la Patte-d'Oie de Gonesse, Roissy-en-France et Le Mesnil-Amelot a été déclassé en 1973 et renuméroté en D902 à l'Ouest de l'aéroport et en D401 à l'Est. La section entre le Blanc-Mesnil et la Patte d'Oie de Gonesse fut récupérée par la RN17. Dès 1978, la RN2 reprend l'intégralité du parcours de la RN2Bis.
Elle devient en 1978 la route de Paris, Porte de la Villette, à la frontière belge, à Bettignies.
En 1990, le tronçon de voie express compris entre Villepinte et Mitry-Mory est absorbé par l'A104.
Conséquence de la réforme de 2005, le tronçon compris entre Paris et Aulnay-sous Bois est déclassé.
Achèvement de la mise en voie express entre Paris et Soissons. Dans le cadre du Plan De Modernisation des Itinéraires routiers (PDMI 2009-2014), les opérations suivantes sont en cours de réalisation :
Déviations de Gondreville et de Vaumoise (mise en service mi-2015).
Doublement de la section Est de la déviation de Villers-Cotterêts (mise en service début 2015).
Sécurisation de la traversée de la forêt de Retz (mise en service mi-2015). Les travaux consistent à mettre aux normes voie express la 2x2 voies existante et de remplacer trois carrefours à niveaux par des échangeurs dénivelés.
Quant aux opérations ci-après, elles font actuellement l'objet d'études et leurs travaux seront programmés ultérieurement sur de prochains PDMI. Il s'agit :
Des déviations de Péroy-les-Gombries et de Boissy-Fresnoy.
De la déviation de Vauciennes.
De la descente de Vauxbuin, en arrivant sur Soissons.
Entre Soissons et Laon, plusieurs autres opérations sont également à réaliser :
L'achèvement de la mise à 2x2 voies de la rocade Est de Soissons.
La sécurisation de la très accidentogène côte de la Perrière à Crouy, par mise en conformité voie express de la 2x2 voies existante et suppression des quelques accès riverains présents.
La mise à 2x2 voies de la RN2 en arrivant sur Laon.
Enfin, dans le département du Nord (59) est envisagé la complétion de la voie express reliant Maubeuge à Avesnes-sur-Helpe. Depuis le 1er septembre 2011, la voie rapide atteint provisoirement Beaufort mais environ dix kilomètres de cette dernière restent à construire.
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D'Aulnay-sous-Bois (D370) à à la limite entre les régions Ile-de-France et Picardie : section gratuite non concédée ayant le statut de voie express, gérée par la DIR Ile-de-France. Cette section comprend un tronc commun de 5 km avec l'A104 et porte le statut autoroutier.
De la limite entre les régions Ile-de-France et Picardie à l'A26 : section gratuite non concédée ayant ou non selon les sections le statut de voie express (RN2), gérée par la DIR Nord.