H-GAC ITS Architecture

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Roadway Signal Preemption Functional Object

Description

'Roadway Signal Preemption' includes the field elements that receive signal preemption requests from trains, boats (i.e., drawbridge crossings), emergency vehicles, or light rail transit vehicles approaching a signalized intersection and overrides the current operation of the traffic signals to stop conflicting traffic and grant right–of–way to the approaching vehicle. This functional object also services preemption requests received from a TMC to support implementations where the preemption requests are managed by the center.

Included In

City of Houston Traffic Signals
City of Baytown Traffic Signals
City of Conroe Traffic Signals
City of Galveston Traffic Signals
City of Sugar Land Traffic Signals
Missouri City Traffic Signals
Texas City Traffic Signals
Local Agencies Traffic Signals
City of Galveston Signal Preemption
City of Houston Signal Preemption
League City Traffic Signals
Missouri City Signal Preemption
City of Pearland Traffic Signals
City of Pearland Signal Preemption
City of Sugar Land Signal Preemption
Harris County Traffic Signals
Harris County Signal Preemption
TxDOT Houston Signal Preemption
Local Agencies Signal Preemption
TxDOT Houston Traffic Signals

Functional Requirements

ID	Requirement	User Defined
1	The field element shall respond to signal preemption requests from emergency vehicles.	False
2	The field element shall inform the controlling center when preemption requests have been received.	False
3	The field element shall send the preemption request to the signal controller to immediately preempt the signal for the requested direction.	False