In municipality of Monza has been prepared the preliminary design about a work that concerns the realization of a two levels junction with a underpass along viale Stucchi in order to provide an uninterrupted flow for users travelling from north to south and vice versa, this work includes also a new roundabout at the higher level to manage east/west flow. The underpass will be configurating as a main interurban road with lanes 3,75m width, lateral shoulders 1,75m, internal shoulders 0,5m and median strip 2,5m. The tunnel will have 22m of total width and lenght 85m, the guaranteed high will be about 5,5m in order to allow transit of every kind of vehicle. The new roundabout will have diameter 75m with ciculatory roadway 9m width and shoulders width 1m. Entries will be all with 2 lanes except the north entry that will have only one entry lane. Exits will be with single lane 4,5m width except the west one that will be with double lane. The lateral road on west side in some segments will be improve with a new lane reaching a total width of 9m. Direct right turn ramps will also be a single lane with total width of 5,5m and 3,5m of lane.