This Used Heavy-Duty Vehicles and the Environment: A Global Overview of Used Heavy-Duty Vehicles: Flow, Scale and Regulation report analyses the flow and scale of used heavy-duty vehicles (HDVs) from three major used HDVs exporters – Japan, the European Union (EU) and Republic of Korea (ROK). It also reviews the regulatory environment for used HDVs import in 146 countries, 122 of which are low- and middle- income countries (LMICs). It is the first attempt to quantify and qualify used heavy-duty vehicles globally. Its findings are based on limited data sets. At the time of the study, data on the export of used HDVs from the US was not available due to the inclusion of both new and used HDVs in the export data. In addition, even though China is a major manufacturer of HDVs, its global export share is low and only recently (2019) started to export used HDVs.