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EXHIBIT 4 <br /> B. Traffic Signal System, Controllers and Cabinets <br /> The City of Santa Ana <br /> currently operates Econolite's <br /> Centracs Advanced -- <br /> Transportation Management <br /> System (ATMS)software, <br /> which communicates with <br /> traffic signal controllers TIPr <br /> through the City's Ethernet , _ •� <br /> communications network. •�� ' <br /> Centracs ATMS provides a <br /> citywide, map-based interfacethat allows staff to quickly view <br /> intersection status and identify <br /> locations that are of line, <br /> online, or requiring attention. <br /> The system supports remote - I <br /> monitoring and <br /> troubleshooting by providing <br /> access to controller status <br /> information, alarms, and event • " <br /> logs. Centracs ATMS also <br /> supports remote updates to controller databases, which helps staff implement timing plan changes and coordination <br /> updates efficiently. In addition, Centracs can generate automated notifications, including email alters for traffic signal <br /> pre-emption faults. Together, these capabilities provide the City with a centralized platform to monitor system health, <br /> respond to issues quickly, and support efficient ongoing management of traffic signal operations. Figure 2 provides <br /> an example of the Centracs citywide status map interface. <br /> Figure 2—Centracs Citywide Signal Status Figure 3—Centracs Intersection Signal Graphics <br /> Overview Map <br /> 3 <br /> � r <br /> 0 - <br /> 0 a:0.,...... _ <br /> - 00 00 O 00 0 <br /> -_ -- <br /> 00 O <br /> -0 0 - - 4 OTC y� - <br /> t 0 0 O 0 i <br /> 9 O o f <br /> ' oO <br /> - O <br /> '. Odd'�O O 00"6 O <br /> G O B <br /> I � <br /> SANTA ANA LOCAL SIGNAL SYNCHRONIZATION PLAN I 7 <br />