The European Commission estimates have shown that the costs of various forms of externalities occurring in the transport sector, such as accidents, air pollution, climate change, noise, and congestion, have risen three times in 2008, 2014, and 2019. Among them, the report published in 2019 is the latest report that systematically summarizes the results of numerous independent, individual, and partial studies conducted in Europe. The report provides additional information to existing research, estimation methodologies, basic data, estimation results, limitations, problems, etc., for the cost estimation of each external effect. This paper introduces the core contents of the EC (2019) by limiting the noise generated by various external effects on traffic inquiries, particularly the external cost basic unit, average cost, and marginal cost of traffic noise for all EC member countries. Simple values present the results of converting the Korean cost using the traditional method. Subsequently, the method through which the external cost of traffic noise converted in this way is utilized is presented in detail.