emergency_vehicle_preemptions

This data flow is sent by the Manage Emergency Services function to the Manage Traffic function. It contains the data necessary for an individual emergency services vehicle and the stream of traffic in which the vehicle is traveling to be given preemption at a traffic signal controller. This will be at the controller for a particular road junction, pedestrian crossing, or highway entrance ramp. The data is sent directly from the emergency vehicle to the next controller along its route and therefore is not subject to any centralized coordination. Local coordination may be provided if there are links between adjacent controllers. The data flow consists of the following data items each of which is defined in its own DDE:

emergency_vehicle_intersection_preemption
+ emergency_vehicle_pedestrian_preemption
+ emergency_vehicle_ramp_preemption
+ emergency_vehicle_sign_preemption

Sub Data Flows

• emergency_vehicle_intersection_preemption
• emergency_vehicle_pedestrian_preemption
• emergency_vehicle_ramp_preemption
• emergency_vehicle_sign_preemption

Parent Data Flows

• em_to_device_control
• signal_override_status

Associated PSpecs/Terminators

• 5.3.3 - Provide Emergency Vehicle Location
• 1.2.7.3 - Manage Local Signal Priority and Preemption Requests

Parent Information Flows

• local signal preemption request