The issue of aggression and aggressiveness in road traffic becomes more and more important for the police to accomplish their tasks. So far, there are few findings concerning the study of aggression offender-oriented investigation in the field of road traffic. Ultimately, this is also to be attributed to the difficulty of uniformly defining aggressive behavior in traffic in the light of psychological, legal and police matters. The author of the article pays attention to the analysis of representative investigation procedures conducted in order to reveal the type of offenders and their criminal records and provide prognoses on victims and possible situations which expedite wrong conduct by individuals. The author provides the percentage of offenders who were already known to police in advance, emphasizing the fact that the perpetrators of offenses of aggression are far more frequently defendants in criminal proceedings than the average population. The article shows the results of the research carried out by the author on aggression and aggressiveness in traffic displayed by the perpetrators bearing in mind their age, sex and marital status. In the Federal Republic of Germany as well as in whole Europe the problem of aggressive behavior has been widely recognized and is reflected in a number of prevention campaigns. Actions in order to prevent aggression and aggressiveness in traffic should be taken with regard to all participants of road traffic. (Published Abstract)