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It is clear that both existing developed properties and <br />undeveloped properties will benefit from construction of the <br />transportation corridors. Development fees are proposed to <br />finance a portion of the corridors proportional to the traffic <br />demands, measured in trip ends, created by new growth. The <br />portion of cost based upon existing trip ends represents the <br />benefit to developed properties. Revenue for the cost allocated <br />to existing development will be provided from public funding <br />sources identified in Section V, "Overall Financing," of this <br />report and, therefore, will not be assessed to individual <br />properties. <br />The methodology used to determine the AOB consisted of <br />determining the influence the corridor had on trips made within <br />the County. The analysis was cq� ducted with a system of <br />computer programs known as UTPS— (Urban Transportation Planning <br />Systems). The computer programs were tailored for specific <br />Orange County application and are commonly known as the SOCCS?/ <br />travel demand model. <br />The model subdivides Orange County and portions of adjacent Los <br />Angeles County into more than 500 traffic analysis zones (TAZ). <br />The model estimates the number of person trips each TAZ <br />generates based on socioeconomic variables such as population, <br />employment, income and number of housing units. These trips are <br />then distributed from each zone to all other zones by a <br />well - established procedure. The model then determines how many <br />of these person trips will travel by auto, and finally assigns <br />these auto trips onto a highway network. The socioeconomic data <br />used in the AOB analysis is from the San Joaquin Hills <br />Transportation Corridor Study and the Foothill Transportation <br />Corridor Study. <br />Using the trip - making dq�a described above, a select link <br />analysis (program UROAD ) was performed to determine the number <br />of corridor related trip ends which originate in, or are <br />l/ UTPS is a battery of sophisticated computer programs developed and <br />sponsored by the Federal Urban Mass Transportation Agency (UMTA) <br />for forecasting travel demand. <br />South Orange County Circulation Study (SOCCS) travel demand <br />forecasting model developed by EMA /Transportation Planning <br />Division. <br />3/ UROAD is one of the computer programs in UTPS. It is a <br />comprehensive flexible highway assignment and analysis program. <br />-13- <br />