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: Unlike direct radio, which is limited by line-of-sight and distance, network-based SPaT can reach vehicles much further away, allowing for earlier planning.
In the context of technology, SPaT (Signal Phase and Timing) over the network refers to the transmission of real-time traffic signal data from infrastructure to vehicles using cellular or cloud-based communication instead of just direct short-range radio. What is SPaT Over the Network? SPAT over the network
: Provides current signal states (red, yellow, green) and the residual time remaining for each phase. : Unlike direct radio, which is limited by
: It integrates traffic signal controllers with central management systems to broadcast data across entire corridors or urban networks. Key Benefits & Applications Signal Phase and Timing (SPaT) Message : Provides current signal states (red, yellow, green)
Traditionally, SPaT messages were broadcast via , which requires a vehicle to be within a few hundred meters of a physical roadside unit (RSU). SPaT over the network leverages existing 4G/LTE or 5G cellular infrastructure (C-V2X) and cloud platforms to deliver this data.