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This paper defines the overall problem of electromotive interference (EMI) from an automotive viewpoint. First, the general conditions (coupling modes) that apply within the automobile are described, then the automobile as a source of interference is examined. Performance criteria for electromagnetic automobile radiation limits as defined by various organizations are compared. Methods of measuring EMI are discussed, then the authors examine the environment both inside and outside of the automobile. Finally, the paper presents detailed test results of automotive impedance studies.