To see how overbuilt they are, you have to compare to late masonry stone arch bridges that are more 'airy'. Like so https://en.wikipedia.org/wiki/Paul_S%C3%A9jo

To see how overbuilt they are, you have to compare to late masonry stone arch bridges that are more 'airy'. Like so https://en.wikipedia.org/wiki/Paul_S%C3%A9journ%C3%A9#Gallery https://en.wikipedia.org/wiki/Paul_S%C3%A9journ%C3%A9#Galler... https://fr.wikipedia.org/wiki/Viaduc_de_la_Roizonne https://fr.wikipedia.org/wiki/Viaduc_de_la_Roizonne https://fr.wikipedia.org/wiki/Pont_des_Pierres#/media/Fichier:Pont_des_pierres_-_Montanges-3.jpg https://fr.wikipedia.org/wiki/Pont_des_Pierres#/media/Fichie...