本文件适用于ISO？5053-1:2020，3.22中定义的回转崎岖地形可变范围卡车（以下简称卡车），其在动臂左侧或中心位置（不包括动臂右侧的操作员位置）有特定的操作员坐姿。 本文件规定了一种静态试验方法，用于确定和评估操作员在卡车周围矩形边界和12？m能见度试验圆上的能见度。本文件规定了能见度的性能要求。 也可以使用计算方法或计算机模拟。 本文件不提供间接可见性附加方法的性能要求。 本文件还包括制造商提供的信息。

This document applies to slewing rough-terrain variable-reach trucks (hereinafter referred to as trucks) as defined in ISO？5053-1:2020, 3.22, that have a specific seated operator’s position, on the left-hand side of the boom, or centre position (excluding operator position on the right side of the boom). This document specifies a static test method for determining and evaluating the operator’s visibility on a rectangular boundary close around the truck and on a 12？m visibility test circle. Performance requirements for visibility are specified in this document. A calculation method or computer simulation can also be used. This document does not provide performance requirements for the additional means for indirect visibility. This document also covers information to be provided by the manufacturer.