GREENSHIELDS, B., "THE OBJECTIVE EVALUATION OF TRAFFIC STREAM FLOW," SAE Technical Paper 640434, 1964, doi:10.4271/640434.
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. These included: the functional classification of streets and highways, effect of highway design and control devices on traffic flow, and testing vehicle proving grounds.A recent study using the modified equipment was to determine the effective distance of urban highway travel for supermarket shopping trips.