ISO 3691-1:2011 gives safety requirements and the means for their verification for the following types of self-propelled industrial trucks, as defined in ISO 5053: industrial counterbalanced trucks reach trucks with retractable mast or retractable fork arm carriage straddle trucks pallet-stacking trucks high-lift platform trucks trucks with elevating operator position up to 1 200 mm side-loading trucks (one side only) lateral-stacking trucks (both sides), and lateral- and front-stacking trucks pallet trucks bidirectional and multidirectional trucks tractors with a drawbar pull up to and including 20 000 N rough-terrain, counterbalanced trucks industrial trucks powered by battery, diesel, gasoline or LPG (liquefied petroleum gas).