The covered road and its branches, built in the external walls of the moat, allowed for the movement of troops from the castle to the Ghirlanda. The road has been restored in the section that survived the demolition of the 1800s and is now accessible to visitors. The vaulted ceiling of the road, built entirely in brick, is 2.80 metres in height and is illuminated by hundreds of small windows giving onto the moat, which doubled as positions for marksmen. In all, eight tunnels, which probably gave on to the covered road via a series of doors, have been found.