Via Montebello is a paved city street up to this point and to the connection with Via dei Borzoli, thus it is incorrectly drawn in OSM as a trail. It is clearly shown as a normal city street in Google Street View: https://goo.gl/maps/4ZC4NCMXT8eh9Rvd8

The portion to the south and east is gravel/dirt, however, so the trail marking is appropriate below this note.