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For over 60 years, traffic signals have used direct wire connections between the traffic controller cabinet and the signals and detectors dispersed throughout the intersection. This paper reports on a networked based approach for distributed control and sensing of traffic signal devices. The motivation of the research has been to improve safety and performance while reducing the cost of a signalized intersection installation. This paper presents an Ethernet based network architecture that uses NTCIP for real-time signal control that is combined with the IEEE 1588 precision time protocol for robust operation of safety critical applications. The investigation focuses on improving the accessibility and safety for pedestrians through the use of Smart Signals.
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