If persons are being transported on the back of a truck, that portion of the vehicle must be enclosed to a height of...
(i) At least 350 mm above the surface upon which such persons are seated.
(ii) At least 500 mm above the surface upon which such persons are seated.
(iii) At least 900 mm above the surface upon which such persons are standing.
(iv) At least 1 m above the surface upon which such persons are standing.
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