The use of the mobile phone or consulting a map while driving are some of the behaviors that most mislead the wheel . Driving distraction is a complex problem to study and its influence on the origin of accidents is often underestimated, but we can assure you that it is the leading cause of traffic accidents. The use of a mobile phone, carrying rowdy children, consulting a map while driving or the presence of an insect inside the car are some of the behaviors that Spanish motorists value as the ones that most confuse them behind the wheel, distractions that cause accidents that occur on highways and expressways. Eight out of ten drivers admit to consuming alcohol and drugs simultaneously. On short journeys, drivers perceive less risk and do not assume the possibility of accidents, so in general, they are less cautious. Alcohol, along with medications, are two of the factors that most increase the risk of an accident. Euphoria, sedation, dizziness, decreased concentration, passivity ... These are also some of the effects on the conduction of drugs popularly considered innocuous, such as antitussives or analgesics The book aims to teach all those techniques necessary to investigate and reconstructing traffic accidents in a simple way and avoiding too technical language.