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Scroll down to view the service package description, list of elements, responsible agencies (stakeholders), candidate functional areas and requirements, and flows on this diagram.


Service Package Description

This service package includes systems that dynamically warn drivers approaching hazards on a roadway. Such hazards include roadway weather conditions, road surface conditions, traffic conditions including queues, obstacles or animals in the roadway and any other transient event that can be sensed. These dynamic roadway warning systems can alert approaching drivers via warning signs, flashing lights, in-vehicle messages, etc. Such systems can increase the safety of a roadway by reducing the occurrence of incidents. The system can be centrally monitored and controlled by a traffic management center or it can be autonomous. Speed warnings that consider the limitations of a given vehicle for the geometry of the roadway (e.g., rollover risk for tall vehicles) are not included in this service package but are covered by the ATMS19 – Speed Warning and Enforcement service package. Roadway warning systems, especially queue warning systems are an Active Traffic Management (ATM) strategy and are typically used in conjunction with other ATM strategies (such as ATMS22-Variable Speed Limits and ATMS23-Dynamic Lane Management and Shoulder Use).

List of Elements on this Diagram
Click on Element Name to go to Element Detail Page.

Element Name Stakeholder
ADOT TOC Arizona Department of Transportation
ADOT Lane Management Infrastructure Arizona Department of Transportation
ADOT Vehicle Detectors Arizona Department of Transportation
Traffic Travelers


List of Stakeholder Elements and Roles on this Diagram
Click on Element Name to go to Page with Element Details.
Click on Functional Area/Role to go to Page with Candidate Functional Requirements.

Stakeholder Element Name Functional Area/Role Functional Area Description
Arizona Department of Transportation ADOT Lane Management Infrastructure Roadway Warning This equipment package includes the field equipment used to warn drivers approaching hazards on a roadway. Warnings may be generated in response to roadway weather conditions, road surface conditions, traffic conditions including queues, obstacles or animals in the roadway, and any other transient events that can be sensed. The equipment monitors traffic and roadway conditions and may send data to a traffic management center for processing or may process it to determine when a warning should be issued. When it is determined that a warning should be issued, the equipment is used to alert approaching drivers via dynamic warning signs, flashing lights, in-vehicle messages, etc.
Arizona Department of Transportation ADOT TOC TMC Roadway Warning This equipment package remotely monitors and controls the systems used to warn drivers approaching hazards on a roadway. It monitors data on roadway conditions from sensors in the field and generates warnings in response to roadway weather conditions, road surface conditions, traffic conditions including queues, obstacles or animals in the roadway, and any other transient events that can be sensed.
Arizona Department of Transportation ADOT TOC Collect Traffic Surveillance This equipment package remotely monitors and controls traffic sensors and surveillance (e.g., CCTV) equipment, and collects, processes and stores the collected traffic data. Current traffic information and other real-time transportation information is also collected from other centers. The collected information is provided to traffic operations personnel and made available to other centers.
Arizona Department of Transportation ADOT TOC Traffic Equipment Maintenance This equipment package monitors the operational status of field equipment and detects failures. It presents field equipment status to Traffic Operations Personnel and reports failures to the Maintenance and Construction Management Subsystem. The equipment package tracks the repair or replacement of the failed equipment. The entire range of ITS field equipment may be monitored by this equipment package including sensors (traffic, infrastructure, environmental, security, speed, etc.) and devices (highway advisory radio, dynamic message signs, automated roadway treatment systems, barrier and safeguard systems, cameras, traffic signals and override equipment, ramp meters, beacons, security surveillance equipment, etc.).
Arizona Department of Transportation ADOT Vehicle Detectors Roadway Basic Surveillance This equipment package monitors traffic conditions using fixed equipment such as loop detectors and CCTV cameras.
Arizona Department of Transportation ADOT Vehicle Detectors Roadway Equipment Coordination This equipment package supports direct communications between field equipment. It includes field elements that control and send data to other field elements. This includes coordination between remote sensors and field devices (e.g., Dynamic Message Signs) and coordination between the field devices themselves (e.g., direct coordination between traffic controllers that are controlling adjacent intersections.).


List of Flows on this Diagram
Click on Architecture Flow to go to Page with Applicable ITS Standards.

Source Element Architecture Flow Destination Element
ADOT Lane Management Infrastructure traffic images ADOT TOC
ADOT Lane Management Infrastructure traffic flow ADOT TOC
ADOT Lane Management Infrastructure roadway warning system status ADOT TOC
ADOT Lane Management Infrastructure roadway equipment coordination ADOT Vehicle Detectors
ADOT Vehicle Detectors roadway equipment coordination ADOT Lane Management Infrastructure
Traffic traffic characteristics ADOT Lane Management Infrastructure
ADOT TOC video surveillance control ADOT Lane Management Infrastructure
ADOT TOC traffic sensor control ADOT Lane Management Infrastructure
ADOT TOC roadway warning system control ADOT Lane Management Infrastructure

Last updated: 06-24-13