ATMS24-Dynamic Roadway Warning (Service Package*)
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).
Service Package Graphic
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About this Graphic
Includes Equipment Packages and Subsystems:
Includes Architecture Flows:
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Related ITS Applications of ITS Taxonomy
||ITS Application Area
||Crash Prevention & Safety
||Crash Prevention & Safety
||Road Geometry Warning
||Road Weather Management
||Traffic Control - Control Strategies
User Services related to this Service Package:
Transaction Set Diagram
The source graphic, a Windows Metafile (WMF), for the TSD can be downloaded here:
The following discusses how the National ITS Architecture provides the transportation service described by this service package. Each numbered item describes the operation of that portion of the service package identified with the corresponding number on the transaction set diagram.
Equipment on the Roadway is constantly monitoring traffic conditions (traffic characteristics) including the formation of queues.
The current weather and roadway conditions (environmental conditions) including icy patches and other obstacles are also monitored.
The roadway is constantly monitoring for the presence of obstacles (physical presence) including stalled vehicles, debris in the road or any other element which is in a potential path of a vehicle
To assist in identifying potential obstacles including queues, the equipment on the Roadway can identify specific vehicles and their characteristics (vehicle characteristics), (i.e. speed, acceleration, length, etc.)
To obtain information about traffic including queue formation, the Traffic Management Subsystem can control (traffic sensor control) and monitor (traffic flow) sensors in or along the Roadway.
The Traffic Management Subsystem can monitor video surveillance (traffic images) for the presence of potential obstacles. The equipment can be controlled (e.g. pan/tilt/zoom) (video surveillance control) by the Traffic Management Subsystem.
The Traffic Management Subsystem controls (roadway warning system control) the equipment on or along the roadway that monitors the roadway and displays warnings (driver information) to Drivers when they are approaching an obstacle.
The Traffic Management Subsystem can monitor the status of this equipment (roadway warning system status).
The equipment on or along the Roadway used for dynamic roadway warnings can be coordinated (roadway equipment coordination) with signs, signals or Field-Vehicle Communications equipment.
The entire process is under the asynchronous monitoring (traffic operator data) and control (traffic operator inputs) of Traffic Operations Personnel.