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IBC VISION PLAN 2018 TRAFFIC STUDY UPDATE – ALTERNATIVES ANALYSIS Final 1.3 Alternative 2 Alternative 2 tests the removal of the MPAH widening of Red Hill Avenue from four to six lanes between MacArthur Blvd and Main Street. Unlike Alternative 1, the land use scenarios are the same for the Alternative 2 and No Alternative (Buildout with Update) scenarios, which explains why Alternative 2 generates considerably fewer impacts than Alternative 1 as shown in Table 1.3. Alternative 2 generates only two intersection impacts: Flower Street/Segerstrom Avenue in the City of Santa Ana and Flower Street/MacArthur Boulevard in the City of Costa Mesa. The improvement strategies at these locations are shown in Table 1.4 Table 1.3 - Number of Significantly Impacted Locations in the Study Area Under Alternative 2 FACILITY Arterial Segments Intersections Freeway Mainline Freeway Ramps Total ALTERNATIVE 2 0 2 0 1 2 Table 1.4- Alternative 2 Improvement Strategies INTERSECTION ID #INTERSECTION NAME JURISDICTION IMPROVEMENT STRATEGY ALTERNATIVE 2 IMPACTS AND CUMULATIVE DEFICIENCIES 720 719 Flower Street at MacArthur Boulevard Flower Street at Segerstrom Avenue Costa Mesa Santa Ana Add EBR Add WBR 1.4 Traffic Impacts & Fair Share A fair-share methodology was used to evaluate the financial participation of mitigating IBC Vision impacts. The following methodology is applied:   For impacts within the City of Irvine, the IBC Vision Plan is fully responsible. For impacts outside the City of Irvine, the IBC Vision Plan would participate on a fair-share basis. Alternative 2 tests the removal of the proposed MPAH widening of Red Hill Avenue from four to six lanes between Main Street and MacArthur Boulevard. Both the No Project and With Project scenarios use the same With IBC Vision Plan land use assumptions. Alternative 2 is therefore a test of removal of this improvement from the Orange County Master Plan of Arterial Highways (MPAH). For any improvements identified under this scenario, the City of Irvine is responsible for the full cost of mitigation within the City of Irvine and for a fair share basis for improvements outside the City of Irvine. All impacts referenced in this study update represent impacts as defined in the City of Irvine’s Traffic Impact Analysis (TIA) Guidelines, adopted August 2004, or for locations outside Irvine, per the performance criteria for each affected agency. Iteris, Inc. | 10 City Council 21 – 9 4/16/2024