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Where fiber-optic is not available, wireless or hardwire interconnect is used for CCN. The City plans to upgrade all communication to Fiber-optic as funding is available. E. Traffic Signal Synchronization The traffic signals on the designated arterials in the LSSP are inventoried and listed in the Appendix 1. The table identifies all intersection for each arterial, associated controller type and firmware, phasing and detailed synchronization data such as cycle length of each synchronized period and type of sync time (System or Time Based Coordination). Synchronization periods include AM, Mid-day, PM and weekend. IV. Three -Year Capital, Operations and Maintenance Plans The City is committed to provide a high level of effort to maintain its traffic signals, signal systems and related communication infrastructure. The effort will include funding for proper maintenance, operations and upgrade of traffic signals to current standard where necessary. The City's three-year plan for capital improvements, operations and maintenance of the traffic signals on the LSSP is included in the Appendix 2. V. Traffic Signal Synchronization Assessment, Review and Revision As stated earlier, maintaining efficient traffic movements throughout the City and surrounding area is one of the primary objectives. Many components of the traffic signal system including its infrastructure must be repaired, upgraded and or maintained to provide the desired operation results. In addition to maintaining the synchronization of all the arterials in the City, the City also participated in synchronizing many inter jurisdiction arterials (corridors). Travel time and stop reduction, average speed and gas savings have been the normal parameters the City used to measure the success or performance of synchronization. As part of this LSSP, the City supports the use of Corridor Synchronization Performance Index (CSPI) established by OCTA to measure the inter -jurisdiction corridor performance. The CSPI utilizes parameters such as average speed, ratio of green to red signals and stops per mile to compile the score and grade for the entire corridor. The sum of the scores from each of the categories gives the total of the index. The CSPI value is categorized into five levels — Tier I through V. Tier I refers to a CSPI score at or above 80 and indicates very good signal synchronization conditions. Tier 11 with value of 70 to 80 is considered good progression with few stops and good travel time. Tier III with score 60-70 is considered the baseline for good operational performance. CSPI value ranging from 50 to 60 indicates a problem generally fixable with a low cost solutions or signal timing modification. A CSPI below 50 however, indicates a poor corridor performance thereby necessitating larger scale investigation into corridor operations. Over the past three years from 2014 to 2017, the City, in cooperation with OCTA and other local agencies, participated in synchronizing a number of important corridors in the City and adjacent jurisdictions. Many corridors have previously synchronized and maintained, however due to changes in traffic conditions and patterns, periodically complete re -time is necessary and can result in significant improvement in travel time and reduction in delays. 55B915