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This paper describes the evolution of equipment and techniques leading to the development of a “Quality Index of Traffic Flow”. Four applications of the quality index were studied: The development of cost figures for different values of the index; an investigation of the relationship between density, volume and the quality indices; a test of the correlation between gasoline consumption and the quality of flow; and an attempt to discover if there is a correlation between the quality of flow and the frequency of highway accidents. At the conclusion of these studies it became possible to modify the original equipment, as a result the “Drivometer and Traffic Events Recorder” was developed. Using this equipment, a mathematical interpretation of driver’s responses to traffic events was developed and three additional studies were delineated.