The UN TDG, also known as the "Orange Book," is an international regulation developed by the United Nations to harmonize the management of dangerous goods transportation. Updated biennially, it provides a regulatory framework for international transportation organizations, nations, and regions to craft legislation on hazardous materials. This guideline aims to ensure the safe transportation of dangerous goods across various modes of transport (including road, rail, waterway, air, and pipeline), reducing the risk of accidents and protecting human life and the environment. It is divided into two volumes, with this volume detailing recommendations on the transportation of dangerous goods, including the classification of dangerous goods, definitions, consignment procedures, emergency response, compliance assurance, transportation of radioactive materials, and reporting of incidents and accidents; as well as dangerous goods transportation regulations, including general provisions, definitions, training and safety, classification, list of dangerous goods, special provisions and exceptions, Appendix A: List of Classes and Proper Shipping Names, and Appendix B: Glossary of Terms. It is applicable to activities related to the international transportation of dangerous goods.