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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, I <br /> which communicates with <br /> traffic signal controllers <br /> through the City's Ethernet _r _ <br /> communications network. - <br /> Centracs ATMS provides a :_,' <br /> citywide, map-based interface �, <br /> that allows staff to quickly view <br /> intersection status and identify = <br /> locations that are offline, <br /> online, or requiring attention. <br /> The system supports remote <br /> monitoring and 4 <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 1087 <br /> 41 <br /> wy 3 S <br /> .f N <br /> l <br /> 0 I <br /> D0000 <br /> 5 ob First St <br /> �D 0t�o'a O <br /> p <br /> b o b o 0-0- 0 <br /> y <br /> 0 0 o (DO.- <br /> 0 <br /> „p 00 <br /> o <br /> - O <br /> O O oo'--b 0S 00 <br /> p O <br /> 4 C O O <br /> O Q <br /> O O O O J <br /> O <br /> . <br /> 111111110111111111 <br /> City COUCICII 18 8 <br /> SANTI ANA LOCAL SIGNAL SYNCHRONIZATION P%q 7 <br />