Route main road 821
The trunk road 821 or RN 821 was a trunk road French connecting Chartres to Bridge-of-Sling. Following the reform of 1972, it was displaced in RD 921 in the Eure-et-Loir and the Loir-et-Cher and in RD 303 in the the Sarthe.
Old layout of Chartres with Bridge-of-Sling (D 921 & D 303)
- Chartres
- Illiers-Combray
- Husks
- Mondoubleau
- Sargé-on-Sling
- Monplaisir, commune of Sargé-on-Sling (where one meets RN 157)
- Saint-Calais
- Bridge-of-Sling, commune of Lavenay
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