OSMDoudou
The situation is confusing here between Ch. de Ghlin, Rue de Mons, Route de Mons, and Avenue du Régent. Looking at house numbers around and the street sign on house number 224 (saying "Rue de Mons"), it seems a very small segment of N50 is Rue de Mons (along with the dead end in the perpendicular residential road) exists between Ch. de Ghlin and Av. du Régent. So, I renamed that segment of the N50 and added house numbers to clarify.