ISO 26866:2009适用于按照UNECE R.E.3的规定，配备M2、M3、N2、N3、O3和O4类空气制动器的商用车辆。 ISO 26866:2009适用于ISO 15484中定义的产品开发、产品原型、产品规范或验证以及正在进行的系列生产。

ISO 26866:2009 applies to commercial vehicles with air brakes in the categories M2, M3, N2, N3, O3, and O4, as specified in UNECE R.E.3. ISO 26866:2009 applies during product development, product prototypes, product specification or validation, and ongoing series production, as defined in ISO 15484.