1.6.1.2.2: Control HRI Warnings and Barriers

This process is responsible for initiating the activation of HRI barriers at active vehicular and pedestrian grade crossings. When a request is sent to activate the HRI barriers perhaps because of a detection of an oncoming train, this process sends the device control signal to the Manage Device Controls process to activate the barriers. This process also returns state information to the Maintain Device State process concerning the commands that have been initiated by this process.

This process is associated with the ITS Roadway Equipment physical object.

This process is associated with the following functional objects:

• Roadway Standard Rail Crossing
• Roadway Transit Signal Control

This process is associated with the following data flows:

• barrier_control_request
• barrier_device_control
• barrier_device_control_state