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EXHIBIT 4 <br /> V. Traffic Signal Synchronization <br /> Assessment, Review and Revisior <br /> Maintaining efficient traffic operations throughout Santa Ana and <br /> surrounding area is a core objective of the City's traffic management <br /> program. Signal synchronization is a key strategy in achieving this <br /> objective.To support reliable operations,the City regularly repairs, <br /> upgrades, and maintains critical components of the traffic signal system, <br /> including controllers, cabinets, communication systems, and detection <br /> equipment. In addition to synchronization of all the major arterials in the <br /> City,the City also collaborates with neighboring agencies to coordinate <br /> operations along inter-jurisdictional corridors. <br /> Travel time and stop reduction, average speed and gas savings have <br /> been the normal parameters the City used to measure the success of <br /> synchronization. The City has supported the use of Corridor <br /> Synchronization Performance Index(CSPI)established by OCTA shown <br /> in Figure 4 to measure the inter-jurisdiction corridor performance.The <br /> CSPI utilizes parameters such as average speed, ratio of green to red <br /> signals and stops per mile to compile the score and grade for the entire <br /> corridor.The sum of the scores from each of the categories gives the <br /> 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 <br /> very good signal synchronization conditions. Tier II with value of 70 to 80 <br /> is considered good progression with few stops and good travel time. Tier <br /> III with score 60-70 is considered the baseline for good operational <br /> performance. CSPI value ranging from 50 to 60 indicates a problem <br /> generally fixable with a low-cost solutions or signal timing modification. A <br /> CSPI below 50 however, indicates poor corridor performance thereby <br /> necessitating larger scale investigation into corridor operations. <br /> Figure 4-CSPI Score and Description <br /> I Synchronization Description <br /> Signa <br />..�. <br /> • >=80 Very good progression—traveling through signalized intersections Tier 1 <br /> with minimal stops and favorable travel speeds. <br /> •70-80 Good progression—traveling through signalized intersections with Tier 2 <br /> few stops and good travel speeds. <br /> 60-70 Fair progression—traveling through signalized intersections with Tier 3 <br /> moderate stops and fair travel speeds. <br /> •50-60 Limited progression"—traveling through signalized intersections Tier 4 <br /> with moderately high stops and slower travel speeds. <br /> <50 Very limited progression'—traveling through signalized Tier 5 <br /> intersections with frequent stops and slow travel speeds. <br /> SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN I 2 <br />