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