Abstract
From the book of 420 pages only chapter 10 and the referencelist is taken, being the part dealing with traffic psychology and the judgement of driving aptitude. Dealt with are the description of the problem, the way research can be done, the communication barriers between researcher and the person inquired, the way the data are interpretated and the results used, the rehabilitation control especially where drunkenness is involved and suggestions for change, where the research process is found unsatisfactory.