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City of Santa Ana <br />Local Signal Synchronization Plan <br />As stated earlier, maintaining efficient <br />traffic movements throughout the City and <br />surrounding area is one of the primary <br />objectives. Many components of the traffic <br />signal system including its infrastructure <br />must be repaired, upgraded and or <br />maintained to provide the desired <br />operation results. In addition to maintaining <br />the synchronization of all the arterials in the <br />City, the City also participated in synchronizing many inter -jurisdiction arterials (corridors). <br />Travel time and stop reduction, average speed and gas savings have been the normal <br />parameters the City used to measure the success or performance of synchronization. As part of <br />this LSSP, the City supports the use of Corridor Synchronization Performance Index (CSPI) <br />established by OCTA shown in Figure 6 to measure the inter -jurisdiction corridor performance. <br />The CSPI utilizes parameters such as average speed, ratio of green to red signals and stops per <br />mile to compile the score and grade for the entire corridor. The sum of the scores from each of <br />the categories gives the total of the index. The CSPI value is categorized into five levels —Tier I <br />through V. Tier I refers to a CSPI score at or above 80 and indicates very good signal <br />synchronization conditions. Tier II with value of 70 to 80 is considered good progression with <br />few stops and good travel time. Tier III with score 60-70 is considered the baseline for good <br />operational performance. CSPI value ranging from 50 to 60 indicates a problem generally <br />fixable with a low-cost solutions or signal timing modification. A CSPI below 50 however, <br />indicates a poor corridor performance thereby necessitating larger scale investigation into <br />corridor operations. <br />Page 30 2023 <br />City Council 28 — 84 6/20/2023 <br />