Before revision: Span is measured in the horizontal direction either between the faces of the supports (clear span) or between the centers of the bearing surfaces (effective span): center|upright= 3.0 A span can be closed by a solid beam or by a rope.
After revision: Span is measured in the horizontal direction either between the faces of the supports (clear span) or between the centers of the bearing surfaces (effective span): center|upright= 4.0 A span can be closed by a solid beam or by a rope.