(1) All runways and ramps shall be substantially constructed and securely braced and supported. Runways and ramps constructed for use by motor trucks or heavier vehicles shall be not less than 12 feet wide for single lane traffic or 24 feet wide for two lane traffic. Such runways and ramps shall be provided with timber curbs not less than 10 inches by 10 inches, full size timber, placed parallel to, and secured to the sides of such runways and ramps. The flooring of such runways and ramps shall be positively secured against movement and constructed of planking at least three inches thick full size or metal of equivalent strength.

(2) Runways and ramps constructed for the use of persons only shall be at least 18 inches in width and shall be constructed of planking at least two inches thick full size or metal of equivalent strength. Such surface shall be substantially supported and braced to prevent excessive spring or deflection. Where planking is used it shall be laid close, butt jointed and securely nailed.

(3) Runways and ramps constructed for the use of wheelbarrows, power buggies, hand carts or hand trucks shall be at least 48 inches in width. Such runways and ramps shall be constructed of planking at least two inches thick full size or metal of equivalent strength. Such runways and ramps shall be substantially supported and braced to prevent excessive spring or deflection. Where planking is used on such runways and ramps, it shall be laid close, butt jointed and securely nailed. Such runways and ramps shall be provided with timber curbs at least two inches by eight inches full size, set on edge and placed parallel to, and secured to, the sides of such runways and ramps. Bracing for such runways and ramps shall be installed at a maximum of four foot intervals.

(4) Any runway or ramp constructed for the use of persons only which is located at, or extends to, a height of more than four feet above the ground, grade, floor or equivalent surface shall be provided with a safety railing constructed and installed in compliance with this Part (rule) on every open side.

(1) Any platform used as a working area or used for the unloading of wheelbarrows, power buggies, hand carts or hand trucks shall be provided with a floor of planking at least two inches thick full size, exterior grade plywood at least three-quarters inch thick or metal of equivalent strength. Platforms used for motor trucks or heavier vehicles shall be provided with floors of planking at least three inches thick full size or metal of equivalent strength.

(2) Every platform more than seven feet above the ground, grade, floor or equivalent surface shall be provided with a safety railing constructed and installed in compliance with this Part (rule) on all sides except those used for loading and unloading. Such sides when used for the loading or unloading of motor trucks or heavier vehicles shall be protected by timber curbs at least 10 inches by 10 inches full size and when used for the loading or unloading of wheelbarrows, power buggies, hand carts or hand trucks such sides shall be protected by timber curbs at least two inches by eight inches full size set on edge and secured to platform.