The current typological distribution of structures is as follows: 33 road structures, 18 pedestrian and cycle underpasses, 11 pedestrian and cycle bridges, 2 multi-network galleries, 2 metal nozzles, 4 culverts.

The main materials are: concrete (prestressed or reinforced), steel, aluminum, high performance fiber concrete, stone. The artwork called "Ark Kowalski" is a stainless steel lattice structure covered with colored glass plates, attached to the flanks. The detailed description of the services is indicated in the special technical clauses (CCTP) common to both lots.

The simplified visits consist of a visualization of the parts of the work without particular means of access. Each simplified visit makes it possible to determine the evolution of the disorders already noted and to list the nature of the maintenance and specialized maintenance work. The visit report contains, among other things, all of these elements.

Detailed inspections consist of an exhaustive examination of all parts of the work, require specific means of access and specialized personnel. Each detailed inspection makes it possible to quantify, to locate very precisely and to note, by part of work, all the disorders observed. A work program is then proposed, accompanied by a financial estimate. The inspection report contains, among other things, all of these elements.