The following ITSDF paragraphs may be of interest to those in the United States that use rough terrain forklifts to elevate personnel:

ANSI/ITSDF B56.6-2005 (Reaffirmation of ASME B56.6-2002)
Safety Standard for Rough Terrain Forklift Trucks

PART I, INTRODUCTION
2 DEFINITION:

"A rough terrain forklift truck is defined as a wheeled type truck designed primarily as a fork truck with a vertical mast and/or a pivoted boom, variable reach or of fixed length, which may be equipped with attachments. This truck is intended for operation on unimproved natural terrain as well as the disturbed terrain of construction sites. This definition excludes machines designed primarily for earth moving, such as loaders and dozers, even though their buckets and blades are replaced with forks, and machines designed primarily as over-the-road trucks equipped with lifting devices."

PART II, FOR THE USER
5 GENERAL SAFETY PRACTICES
5.15 Elevating Personnel

"5.15.1) A rough terrain forklift truck shall not be used to lift people unless there is no other practical option. If a rough terrain forklift truck must be used to lift people, the following precautions for the protection of personnel shall be taken: (a) provide a personnel platform which complies with the design requirements listed in Part III of this Standard; (b) be certain that the platform is securely attached to the lifting carriage and forks; (c) be certain that the lifting carriage and forks are secured to prevent them from pivoting upward; (d) on trucks equipped with rotators, deactivate the rotation; (e) provide protection for personnel in their normal working position on the platform from moving parts of the rough terrain forklift truck that represents a hazard; (f) provide overhead protection as indicated to be necessary by the operating conditions; (g) be certain that the lifting mechanism is operating smoothly throughout its entire lift range, both empty and loaded [as described in para. 5.15.1(t)], and that all lift limiting devices and latches, if provided, are functional; (h) be certain that the mast or boom travel is vertical - do not operate on a side slope unless the rough terrain forklift truck is leveled; (i) be certain that the platform is horizontal and never tilt platform forward or rearward when elevated; (j) be certain that the rough terrain forklift truck has a firm footing; (k) be certain that required straining means such as railings, chains, cable, body belt(s) with lanyard(s), etc., are in place and properly used; (l) place rough terrain forklift truck control(s) in neutral and set parking brake; (m) before elevating personnel, area shall be marked to warn of work by elevated personnel; (n) be certain that the path of platform travel is clear of hazards, e.g., storage racks, scaffolds, overhead obstructions, and electrical wires; (o) keep hands and feet clear of controls other than those in use; (p) lift and lower personnel smoothly, with caution, and only at their request; (q) always lower the platform if you must move the rough terrain forklift truck for adjustments in positioning; (r) alert elevated personnel before moving the platform. Then move the platform smoothly and with caution. (s) a trained operator shall be in position to control the rough terrain forklift truck, or available to operate controls if the platform is not equipped with controls. When the operator is not in the operating position, block the truck wheels and apply the parking brake with all travel controls in neutral. (t) the combined mass (weight) of the platform, load, and personnel shall not exceed one-third of the capacity at the related load center position as indicated on the information plate(s) of the rough terrain forklift truck on which the platform is used; (u) personnel are to maintain firm footing on platform floor unless secured by body belt and lanyard. Use of railings, planks, ladders, etc., on the platform for purpose of achieving additional reach or height is prohibited; (v) be certain that personnel and equipment on the platform do not exceed the available space; (w) platform shall be lowered to floor level for personnel to enter and exit. Personnel shall not climb on any part of the rough terrain forklift truck in attempting to enter and exit. (x) any body belt, lanyard, or deceleration device which has sustained permanent deformation or is otherwise damaged shall be replaced; (y) prohibit modification to the platform that is detrimental to its safe use."

(Note the first line in 5.15.1. Similar wording may also be in the forklift national consensus standards of other nations.}