ASTM PS 105-99: Specification for Dedicated Short Range Communication (DSRC) Data Link Layer: Medium Access and Logical Link Control

Source Element	Destination Element	Flow
City of Lubbock Field Equipment	Citibus Transit Vehicles	local signal priority request
	City of Lubbock Emergency Vehicles	local signal preemption request
	Private Ambulance Vehicle	local signal preemption request
City of Plainview Field Equipment	City of Plainview Emergency Vehicles	local signal preemption request
TTU Field Equipment	Citibus Transit Vehicles	local signal priority request
TxDOT Lubbock District Traffic Signals	DPS Emergency Vehicles	local signal preemption request
	Municipal or County Emergency Vehicles	local signal preemption request
	Private Ambulance Vehicle	local signal preemption request

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