Applies to the radiation of electromagnetic energy which may cause interference to radio reception and which is emitted from: a) vehicles propelled by an internal combustion engine, electrical means, or both; b) motor boats propelled by an internal combustion engine, electrical means, or both; c) devices equipped with spark ignited internal combustion engines. Establishes uniform requirements for radio interference suppression of vehicles, motor boats and devices and fixes limits of interference. Describes methods of measurement and gives guidance for suppression methods.