Restrictions along the corridor under study:
a) The underground crossing of the Bergamo-Brescia railway, performed by the box jacking technique;
b) Proximity to the fair and the relevant systems, which has influenced the layout of the road axis. In addition, the ways in and out of the east sector of the fair have been totally revised for greater availability to users;
c) The interferences with the Urgagna and Morlino di Grassobbio ditches, which flow parallel to the new road system and for which a deviation project has been developed;
d) The power substation of the State railway line, the earthing system of which generated an interference with the project;
e) An important pressure pipe of the waterworks supplying the municipality of Bergamo, with a restricted area of 4 m width.
Against this background, in order to limit the overall size of the work and the consumption of land, the sections approaching the subway consist of cutting between retaining walls, with driving cover sections to ensure soil permeability.