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5.6.2 Impacts <br />Introduction <br />The entire vicinity of Main Street, including Fashion Square <br />and Town and Country, is undergoing intensive new development. As a <br />i <br />result, the Cities of Santa Ana and Orange jointly developed a <br />computerized travel model to analyze the traffic impacts of new projects <br />! <br />in the area. (That travel model, referred to as the SATC/TSIP Model, is <br />t <br />a derivative of the regional Multi -Modal Transportation Study (MMTS) - <br />1. <br />Santa Ana Transportation Corridor (SATC) Model. The only difference is <br />that the SATC/TSIP version of the model disaggregates the area of North <br />} <br />Santa Ana/South Orange into smaller zones and includes a highway network <br />with Primary and Secondary classifications rather than only the "Majors" <br />i <br />included in the MMTS/SATC Model). <br />i <br />r <br />The SATC/TSIP Model was created for the purpose of analyzing <br />traffic impacts of various development proposals as they come forth. <br />L3 <br />The SATC/TSIP Model incorporates an estimate of the maximum density <br />envisioned for each zone along Main Street as well as current estimates <br />�+f <br />for additional development in the remainder of the region. This model <br />formed the basis for travel forecasts expected from the maximum planned <br />l <br />development in the Main Street area and a master plan of transportation <br />improvements for highway and transit facilities was developed. <br />The availability of the travel model and the designation of <br />the zones in the vicinity of Main Street are well suited for the traffic <br />analysis necessary in the EIR process. In fact, the regional model, <br />i <br />which has been refined for detailed analysis of the study area, provides <br />considerable more information for an EIR study than is normally <br />1 <br />� <br />available. The model provides for distribution and assignment of travel <br />r <br />on region -wide basis. Frequently, traffic studies for EIR purposes must <br />? <br />make large assumptions as to the trip generation distribution and <br />assignment from a new or expanded facility. These assumptions can be a <br />weakness when the project under consideration is large and the resulting <br />75D-2248 <br />