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The Highway Investment Analysis Package (HIAP) is a computerized evaluation and investment programming model developed to aid State, regional, and local organizations in making the best use of limited highway funds. Using micro-economic theory, HIAP analyzes alternative (including staged) improvements to individual roadway sections and limited networks of sections specified by their physical, traffic, and operational characteristics. Estimates of both highway user (i.e., vehicle operating costs, travel times, and accidents) and non-user (i.e., noise levels and air pollutant emissions) impacts are produced. Non-user impacts may be compared to specified threshold values to identify environmental problems and to screen improvements for the program selection process. HIAP uses marginal analysis to develop multiperiod investment programs, selecting those improvements which maximize either user benefits or one of several accident reduction measures. The selection process permits consideration of a broad range of funding constraints, which may be tailored to the specific needs of individual organizations. It allows consideration of multiple alternatives and staged improvements at each analysis site. Great flexibility in the content and format of input data is afforded the analyst. Furthermore, HIAP includes a transformation program which allows the analysis of data already available in the format used for the 1970-1990 Highway Needs Study.