ISO 11850:2003 specifies safety requirements for common design aspects of mobile, ride-on, self-propelled forestry machines. It is applicable to fellers, bunchers, delimbers, forwarders, logloaders, skidders, processors, harvesters, and multi-function versions of these machine types, as defined in ISO 6814. It is not applicable to the optional attachments for these machines. It covers certain hazards common to forestry machinery, but does not as a standard that addresses common requirements deal with all the hazards (noise, vibration, thrown objects, etc.) which could exist on a particular machine. Its use will therefore not alone be sufficient to cover all significant risks for a majority of machines.