large structure made of wood, steel, or concrete arched or flat design supports a bridge or roadway a visible roadbed or walkway visible abutments, piers, or other support structures span may be marked with signs or other identifiers
span which has large structure made of wood, steel, or concrete span which is arched or flat design span which has supports a bridge or roadway span which is a visible roadbed or walkway span which has visible abutments, piers, or other support structures span which has span may be marked with signs or other identifiers