Standard Handrail Ladder

The minimum size (cross-section) of grab bars is the same size as the rungs of the ladder. A minimum perpendicular distance of 30 inches (76 cm) from the centerline of the steps or rungs to the nearest object on the climbing side.Single-rail ladder means a portable ladder with rungs, cleats, or steps mounted on a single rail instead of the normal two rails used on most other ladders.A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track.