Roadway Signal Preemption

Overview

'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.

This functional object is included in the "ITS Roadway Equipment" physical object.

This functional object is included in the following service packages:

• PS03: Emergency Vehicle Preemption
• TM14: Advanced Railroad Grade Crossing

This functional object is mapped to the following Functional View PSpecs:

• 1.2.7.1: Process Indicator Output Data for Roads
• 1.2.7.2: Monitor Roadside Equipment Operation
• 1.2.7.3: Manage Local Signal Priority and Preemption Requests

Requirements

Information Flows

Standards

The following table lists the standards associated with the functional object itself (as opposed to standards associated with an interface).