Yep, I understand that now. Here in Italy (where we have lots of mountains and conversely tunnels) the distiction between tunnel and underpass (or overpass) is

Yep, I understand that now. Here in Italy (where we have lots of mountains and conversely tunnels) the distiction between tunnel and underpass (or overpass) is neat, we also have (though not extremely common) distinctions betweeen different kinds of tunnels (Galleria):