13.—(1) So far as is reasonably practicable, suitable and effective measures shall be taken to prevent any event specified in paragraph (3).
(2) So far as is reasonably practicable, the measures required by paragraph (1) shall be measures other than the provision of personal protective equipment, information, instruction, training or supervision.
(3) The events specified in this paragraph are:—
(a)any person falling a distance likely to cause personal injury;
(b)any person being struck by a falling object likely to cause personal injury.
(4) Any area where there is a risk to health or safety from any event mentioned in paragraph (3) shall be clearly indicated where appropriate.
(5) So far as is practicable, every tank, pit or structure where there is a risk of a person in the workplace falling into a dangerous substance in the tank, pit or structure, shall be securely covered or fenced.
(6) Every traffic route over, across or in an uncovered tank, pit or structure such as is mentioned in paragraph (5) shall be securely fenced.
(7) In this regulation, “dangerous substance” means—
(a)any substance likely to scald or burn;
(b)any poisonous substance;
(c)any corrosive substance;
(d)any fume, gas or vapour likely to overcome a person; or
(e)any granular or free-flowing solid substance, or any viscous substance which, in any case, is of a nature or quantity which is likely to cause danger to any person.