The European Metropolis of Lille has been implementing a structured cycling policy for many years but wishes to go further to become a real "cycling metropolis" as part of a complete "bicycle ecosystem". Increasing the comfort and safety of the cyclist is a priority to achieve the objectives of increasing travel in active modes and ensuring better intermodality between modes of travel. The Boulevard de Mons and the Avenue de la Marque are an essential axis to connect the districts of Les Prés and Cousinerie but have unsecured cycling facilities, and even none at the crossing under the Boulevard du Breucq. The development work for the bicycles will restore a secure cycling network and remove the discontinuity of the crossing of the RN 227.