They’re hard at working building a 200-km railroad in Paris right now. The name of this project is ‘Grand Paris’. You can see the ‘Porte Maillot’ section of the project in the photo; they’re working underground on the new station here. Along the outer edge of the project is a row of concrete road blocks (red/white) with Heras M100 fences secured to them. These ensure the safe and effective partitioning of traffic and the construction site. Behind these are the City Fences in the typical colours of Paris, green and grey, to block the view of the site. This means that the crews can safely and effectively work right in the middle of Paris.