The traffic in the large cities requires special effort to young traffic participants and persons with just passed driving-license examination. Statistical investigations show an increasing partake of juveniles to alcohol. The results of the research of the protocols of the blood alcohol analyst's office at the Institute of Forensic Medicine of the MHH show an increasing share of drunken young traffic participants with blood alcohol concentrations below 1%. The special risk of juveniles by drinking and driving results not only of the reduction of the physical capacity because of the low alcohol tolerance, but especially of the reduction of the physical capacity and the personality in total.