This handbook is prepared for the daily, practical needs of those who are involved in traffic accident analysis, investigation, and reconstruction, whether they be in the training, police, private, or legal professions. It also meets international requirements in that all formulae and explanations are provided in both the English (U.S.) and metric (S.I.) measurement systems. In all cases, the two systems are dealt with separately so as to avoid any unnecessary confusion. Provided also are many tables and constants relating one system to the other so that those who may normally work under one system but use reference materials in the other will have a readily accessible means of making any necessary conversions. After an introductory chapter describes the various symbols used in traffic accident investigation and reconstruction, subsequent chapters include very comprehensive formulae required in problem-solving involving acceleration and acceleration factors; center of mass; drag factor and coefficient of friction; slide-to-stop speed; yaw, sideslip, or critical curve speeds; acceleration, distance and time calculations; momentum speed; combined speeds, and distance and time calculations. Additionally, there are various other formulae and mathematical, velocity, and conversion tables presented. All 160 formulae and their various uses are set out in a uniform, easy-to-read, and understandable format. Whether in law, law enforcement, or private or insurance investigation, this book provides traffic accident investigators and reconstructionists with the data they need to perform their job accurately and efficiently.