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(9) <br />CITY OF SANTA ANA <br />operations. For Diamond Interchanges, when possible, off ramp phase single entry <br />operations coupled with coordinated phase through band with offset off ramp band flows <br />should be employed for both directions. Dependent on spacing between off ramp <br />intersections, dual entry operations may be appropriate. <br />C. Consultant shall present from 2 to 3 timing plan operational scenarios dependent on <br />coordinated and crossing arterial traffic conditions for timing plan implementation and the <br />"when", "who", and "how". These scenarios will be part of the initial presentation of the <br />corridor existing conditions, proposed groupings and cycle lengths report. <br />Sub -Task 4.4: Coordinated Optimized Traffic Signal Timing <br />A. Based on a consensus developed from discussions of the scenarios presented and then <br />approved by the Agencies, the consultant shall prepare Coordinated Optimized Traffic <br />Signal Timing Plans for the four (4) Caltrans intersections. <br />B. Consultant will measure the saturation flow rates at key project intersections during one <br />peak hour where the overall intersection volume -to -capacity ratio is greater than or equal <br />to 0.8 as a calibration for the Synchro model. Timing parameters shall provide adequate <br />crossing time to accommodate pedestrians within the phase split. <br />C. Consultant shall develop an operational model within latest SimTraffic Version The <br />operational analysis will be used to micro -simulate and analyze specific roadway <br />segments with queuing, spill back, starvation, storage blocking, and other queuing <br />interactions, and to analyze and mitigate the conditions discovered by consultant <br />and/or City of Santa Ana and Agencies in field reviews <br />D. Consultant shall develop optimized signal timings using the results from <br />Synch ro/SimTraffic, in conjunction with Tru-Traffic and recommend any changes to the <br />signal phasing at each signalized intersection that may improve the efficiency of <br />operations. Output of the modeling software shall not be utilized without proper <br />QA/QC. Engineering judgment shall be utilized to determine final operational <br />parameters. The recommended signal timing plans shall be reviewed by the City of <br />Santa Ana and local Agency staff. <br />1. Consultant shall prepare, at minimum, three (3) timing plans for a typical <br />weekday which consider the following peak periods: AM PEAK, MID -DAY <br />PEAK, PM PEAK and one (1) timing plan for a typical Saturday/Sunday MID- <br />DAY PEAK. Timing plans should be in Synchro, Tru-Traffic, and the preferred <br />timing chart format of Caltrans or each local Agency. <br />2. Consultant shall prepare, special plans for congestion mitigation based on <br />scenarios approved by the Agencies. <br />20 <br />