0 a bridge that carries a road or railway over another road -- paso sobre nivel, paso elevado
1 a road etc which is built up so as to cross above another; overpass American -- paso superior, paso elevado
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Podemos completarlo paso a paso, por muy largo que sea el camino, y no se puede completar, por corto que sea el camino, si ni siquiera marcas tu huella.