This gulf standard specifies a method for measuring the A-weighted sound pressure level of the noise emitted by agricultural and forestry wheeled tractors and self-propelled machines, fitted with elastic tyres, the noise being measured while the vehicle is in motion. It is not applicable to special forestry machinery, for example, forwarders, skidders, etc., as defined in clause 2.1. Note: The test method calls for an acoustical environment which can only be obtained in an extensive open space