La route nationale 20B, ou RN20B, est une ancienne route nationale française, antenne de la RN20, qui a connu deux affectations successives.
Elle est définie en 1933 comme étant l'annexe de Llivia.
Puis on retrouve cette dénomination pour la route reliant le Col de Puymorens au Pas de la Case, classée par un décret du 09/12/1907, à la frontière de la Principauté d'Andorre. C'est donc à la numérotation de celle-ci que la route de l'enclave de Llivia devint la N20C.
Elle est inaugurée le 19/10/1910 à l'exception des 300 derniers mètres ouverts en juillet 1911 (1). Sa viabilisation totale est achevée en 1933.
Elle fut transformée en 1973 en N22, numéro qu'elle a conservé depuis.
Tracés historiques
Vers Andorre
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Légende de la carte
En rouge
Tracé de 1933 à 1973.
Pour plus d'informations sur les sources cartographiques, consulter cet article.
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Légende de la carte
En rouge
Tracé en 1933.
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.
Pas de la Casa (2085 m)
