Traffic Signal Preemption at Intersections Near Highway–Rail Grade Crossings (2017) / Chapter Skim
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22 Interconnection is the process by which the railway system communicates with the traffic signal system, as shown in Figure 3. Historically, the interconnection has been a simple two-wire preempt.
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23 The railway can also provide a gate-down output (RO3) , but this requires additional railway logic to determine when all the gates are down and provide a backup output (i.e., gates broken)
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24 ADVANCED SYSTEMS Typical interconnection systems are based on relays in the railway warning time system and the highway traffic signal system. Although relay-based systems are extremely reliable, there are more stateof-the-art approaches to interconnection that increase functionality.
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