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34 <br /> The TCC will recommend reappraisal to the TAC and will submit <br /> a reappraisal work plan for approval by the TAC. The <br /> following work elements may be required depending upon the <br /> depth of the studies needed. <br /> Agency responsibilities for various work tasks in <br /> transportation plan evaluation elements are given in Appendix <br /> B. <br /> 1. Retabulation of Land Use. Population and Socioeconomic <br /> Data <br /> Local governments shall be responsible for the collection <br /> of land use, population, and socioeconomic data by traffic <br /> zone. The Statewide Planning Branch shall tabulate the <br /> following data for existing conditions by traffic zone: <br /> (1) population; (2) dwelling unit data; and (3) employment <br /> by standard industrial classification (SIC) .* It is <br /> expected that a reprojection of travel patterns, including <br /> transit potential, would require a retabulation of those <br /> factors used in developing the mathematical models. <br /> 2. Traffic ouits at Stations and Key Intersections <br /> Traffic counts will be taken at screen line stations, o <br /> external stations, and key intersections as required for <br /> reevaluation. Traffic counts at screenline and external <br /> cordon stations will consist of hourly machine counts for <br /> one two-week period and hourly manual classification <br /> counts for one 24-hour period. Intersection counts will <br /> consist of manual turn counts by vehicle classification, <br /> in accordance with accepted procedures. <br /> 3. Evaluation of Mathematical Models <br /> Analysis of mathematical models used in past studies shall <br /> follow these steps: <br /> a. Trip Generation - generally involves analysis of actual <br /> and projected socioeconomic data including, but not <br /> limited to, population, dwelling units, and employment. <br /> Based on these and other factors, an approximation of <br /> the number of trips generated by subarea or zone can be <br /> determined; <br /> b. Trip Distribution - using formulas based on the gravity <br /> equation, an approximation of where the specific <br /> generated trips are beginning and ending is determined; <br /> 12 <br />