been built to permit the offloading of the barges. New barges were developed to carry A380 parts. These incorporate ballast tanks, to enable the barges to adjust their water and air draughts to the prevailing conditions. Certain parts of the route must be undertaken at high tide in order to provide sufficient water under the keel, whilst the passage under the Pont de pierre in Bordeaux is undertaken at low tide to provide sufficient headroom. The Canal de Garonne allows barges to go to Toulouse but has insufficient headroom for A380 parts, requiring parts to travel by road on the final leg of their journey. By road convoy to Toulouse From Langon the parts are taken by oversize road convoys over a southerly, and indirect, route to Toulouse. The route was largely determined by the need to avoid any over-bridges. Many adjustments were necessary to junction and other layouts to allow the convoys to pass. In places new roads were constructed, some of which are reserved for the use of the convoys. Convoys travel mostly at night, laying over during the day at specially constructed secure parking areas. The route passes through or past the following places, following the N524, N124 and N224 roads: Langon Bazas Bernos-Beaulac Captieux Maillas Losse Gabarret Barbotan-les-Thermes Eauze Dému Vic-Fezensac Saint-Jean-Poutge Auch Aubiet Gimont L'Isle-Jourdain Ségoufielle Lévignac Cornebarrieu The section to Toulouse is designed for transporting a package of a size up to 14 meters high, 8 meters wide and 50 meters long. References External links Official web site of the Itinéraire à Grand Gabarit (in French) Airbus A380 Gers Gironde Haute-Garonne Landes (department) Transport in Occitania (administrative region)