Route départementale française D20 (31)

Route départementale D20 (31)
Localisation
Pays	France
Département	Haute-Garonne (31)
Caractéristiques de 1813 à 1933
Itinéraire	Las Cases (81) - Cinq Coins / Revel - La Pomarède (11)
Longueur	5,5 km
Caractéristiques de 1938 à 2016
Itinéraire	Fournerie - Teulat (81) / Bannières (81) - Villeneuve-lès-Lavaur (81) / Loubens-Lauragais - Saint-Félix-Lauragais
Longueur	61,2 km
Caractéristiques actuelles
Itinéraire	D29 - M20 (Fournerie - Saint-Jory) M20 - N126 (Saint-Jory - Teulat (81)) N126 - N126 (Bannières (81) - Villeneuve-lès-Lavaur (81)) D826 - D622 (Loubens-Lauragais - Saint-Félix-Lauragais)
Longueur	56,9 km

Présentation

• La route départementale D20 (31), ou RD20 (31), est une route départementale de la Haute-Garonne (31) qui relie Fournerie à Vendine et à Saint-Félix-Lauragais.
• La section de cet axe située entre Verfeil (A680) et le département du Tarn (81) se trouve dans le prolongement direct de la RN126 dont le parcours a été réorienté en 2006. Pour autant, elle n'a jamais été classée dans la voirie nationale, contrairement au parcours dans le département voisin (ex-D42 (81)). Il en résulte une discontinuité unique du réseau routier national qui se matérialise sur le terrain par une signalisation inadaptée, dont des panneaux blancs sur un grand itinéraire.
• Il semble que cette situation aberrante soit appelée à perdurer jusqu'à la construction de l'autoroute A69 dont une partie pourrait recouvrir le tracé de l'actuelle D20.
• La D20 (31) possède plusieurs annexes :
  • la D20^A correspond à l'annexe de Montberon vers Bazus ;
  • la D20^B correspond à l'annexe de la gare de Garidech ;
  • la D20^C correspond à l'annexe de Gragnague au lac du Laragou ;
  • la D20^D correspond à l'annexe de Loubens-Lauragais ;
  • la D20^E correspond à l'annexe de Verfeil ;
  • la D20^F correspond à l'annexe de Bonrepos-Riquet ;
  • la D20^G correspond à l'annexe de Saint-Sernin des Rais à Prat Long (Verfeil).

Historique

Généralités

• À sa création en 1813, la route départementale française D20 (31), ou RD20 (31), est définie par le décret du 7 janvier 1813 comme étant la route de Rodez (Aveyron) à Tarascon (Ariège). En 1933, la route sera reversée aux RN622 et RN624.
• Après 1938, la nouvelle RD20 (31) issue du Gc20 (31) classé en 1936, devient la route de Grenade à Castres (Tarn) et à Saint-Félix-Lauragais, par Verfeil, reprenant le tracé de l'ancien Gc3 (31) classé entre 1836 et 1935 comme étant le chemin de Villefranche à Grenade, ainsi que de l'Ic6 (31) classé entre 1843 et 1935 comme étant le chemin d'Auriac à Vendine.
• Depuis le 1^er janvier 2017 son exploitation est assurée par Toulouse Métropole au niveau de Saint-Jory. En conséquence, elle est devenue une route métropolitaine sous l'appellation M20, les cartouches ayant été changés sur le terrain en 2021.

Aménagements

• Déviation courte de Saint-Jory : 1988-1989.
• Déviation de Verfeil : 30 juin 2003 (DUP du 18 janvier 2000).

Autour de la route

• Le Lauragais
• La Garonne

Tracés

de Grenade à Saint-Félix-Lauragais (après 1938)

Chargement de la carte...

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Légende de la carte ou du tableau
En rouge	Tracé de la RN126 dans le département du Tarn (81).
En jaune	Tracé de la D20 (31) devant rester départemental.
En vert	Tracé de la D20 (31) devant devenir national.
En bleu ciel	Tracé de la M20.
En violet	Troncs communs avec d'autres routes.
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.

• Haute-Garonne (31) - D20
  • D29 Fournerie
  • Saint-Caprais Le Girou
• Haute-Garonne (31) / Toulouse Métropole - M20
  • Saint-Jory M820 La Garonne
• Haute-Garonne (31) - D20
  • Saint-Sauveur
  • D4
  • Cépet D14
  • Labastide-Saint-Sernin
  • Les Starguets
  • Monvert D888
  • A680
  • Gragnague Le Girou
  • Verfeil-Monplaisir A680 D112
• Tarn (81) - N126
  • Le Pré-de-la-Fadaise
• Haute-Garonne (31) - D20
  • D11
• Tarn (81) - N126
• Haute-Garonne (31) - D20
  • D826
  • Auriac-sur-Vendinelle D1 La Vendinelle
  • Tourrettes
  • Falga
  • Saint-Félix-Lauragais D622

de Rodez à Tarascon (de 1813 à 1933)

Chargement de la carte...

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Légende de la carte ou du tableau
En jaune	Tracé historique de la route.
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.

• Tarn (81) - D622
• Haute-Garonne (31) - D622
  • Quilles
  • Cinq Coins D79
• Haute-Garonne (31) - D624
  • Lemmarse D622
  • Les Thomasses D79
• Aude (11) - D624