1.6.1.7.1: Control Traffic Volume at Active HRI

This process is responsible for controlling vehicular traffic at an active HRI by controlling the operation of traffic control devices in accordance with a predetermined local control plan. The local control plan is communicated to the Close HRI on Detection process. This local control plan can be preempted by a strategy preemption message from the Detect HRI Hazards process or by such inputs as an event notice from the Detect Roadway Events process or HRI traffic surveillance data. The outputs of this process include the command messages to close the HRI, requests for information from the Manage Traffic function, and information about the current HRI traffic data.

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

This process is associated with the following functional objects:

• Roadway Advanced Rail Crossing
• Roadway Standard Rail Crossing

This process is associated with the following data flows:

• close_hri
• event_notice
• hri_traffic_data
• hri_traffic_surveillance
• local_control_plan
• preemption_command
• strategy_preemption
• traffic_management_request