Cobblestone section 3 of the cycling classic Paris/Roubaix known as Le Carrefour de l'Arbre to Gruson. It has a length of 1,100m. It was first used in 1978. This section drops from 50m to 45m in a straight line. It was incorporated into stage 3 of the 2004 Tour de France between Waterloo and Wasquehal.