This book is formulated to standardize and regulate highway safety audit. It is applicable to the stages of feasibility study, preliminary design, detailed design, pre-opening and operation of motorways and class-1, class-2 and class-3 highways. Based on recent research and practical experience in China and foreign countries, development of the current focus safety audit, and the requirement to develop a framework for “Safe Transportation”, this book is issued for implementation accordingly. With the rapid development of the highway transportation industry and a growing demand for traffic safety in China, strengthening and promoting the application of highway safety audit has become inevitable. This book has been important for improving highway facilities and traffic safety conditions and promoting improved highway safety since its implementation.