Book excerpt: Estimating the Human Cost of Transportation Accidents: Methodologies and Policy Implications discusses the estimation methods needed to determine the monetary value of loss of life and quality of life when evaluating transportation safety programs, policies and projects. In addition, it highlights how to overcome the many challenges researchers face in choosing the right values, including estimating loss of life and life quality, examining strengths and weaknesses, and critically analyzing social costs and implications. This book will allow researchers to better formulate accurate social costs, select safety improvement values, and understand limitations.