United States Department of Transportation
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Abstract:This research procedure is commonly known as the "Before and After" approach. Quite simply, its aim is to develop a complete picture of an area under its original set of operating conditions, let the operating conditions be changed, and then develop another picture. The research techniques carried on under this program are merely the mechanical workings of the researcher's analogous camera. After the research approach was decided upon and the problems of financing solved, the first step was to select the appropriate areas for study. Funds and personnel were available to handle three separate study sites. These were selected on the basis of the size of city, the scheduling of median construction, the density of traffic, the type of commercial and residential development and the availability of the needed traffic and economic information.
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