ISO 22915 deals with the safety of industrial trucks, as defined in ISO 5053, relative to their stability and the verification of that stability. For the purposes of ISO 22915, industrial trucks are wheeled, self-propelled or pedestrian-propelled vehicles, excepting those running on rails. They are either operator-controlled or driverless and designed to carry, tow, push, lift, stack or tier in racks. ISO 22915-1:2008 specifies basic test criteria and requirements to verify stability for industrial trucks, referred to simply as trucks. It applies to the following truck types and special conditions: counterbalanced trucks with mast; reach and straddle trucks; pallet stackers, double stackers and order-picking trucks up to and including 1200 mm; single side loading trucks; bidirectional and multidirectional trucks; additional stability test for trucks operating in special conditions of stacking with the mast tilted forward; counterbalanced trucks with mast handling freight containers of 6 m (20 ft) length and longer; additional stability test for trucks operating in special condition with the load substantially laterally displaced by powered devices; industrial variable reach trucks; industrial variable reach trucks handling freight containers of 6 m (20 ft) length and longer; rough terrain variable reach trucks; counterbalanced trucks with articulated steering; pedestrian propelled trucks; burden and personnel carrier; additional stability test for trucks operating in a special condition with offset load, offset determined by utilisation; order-picking trucks with elevating operator position above 1200 mm. ISO 22915-1:2008 does not apply to: trucks handling suspended loads which may swing freely; low lift trucks with lift height up to and including 500 mm.