I cross the N20 at Lamothe Cassel on my bike often and I would not qualify it as peacefull and quiet as there is still traffic. In my opinion 50 meters would not give you enough distance. Harrynac
We had our roof, 180 square meters ,done for 800 euros although they did ask for 1100 to begin with. Pay attention to the "produit" they use because in our case they used plain bleach which damaged some of the plants below the edge of the roof.