ATMS24-Dynamic Roadway Warning (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).

Service Package Graphic

Traffic Equipment MaintenanceRoadway WarningRoadway Equipment CoordinationTMC Roadway WarningCollect Traffic SurveillanceRoadway Basic SurveillanceTraffic ManagementOther RoadwayRoadwayRoadway EnvironmentDriverTrafficTraffic Operations PersonnelPotential ObstaclesVehicle Characteristicstraffic flowtraffic imagestraffic sensor controlvideo surveillance controlroadway equipment coordinationtraffic operator dataroadway warning system controltraffic operator inputsroadway warning system statusenvironmental conditionsdriver informationtraffic characteristicsphysical presencevehicle characteristics

Get the Source Graphic, a Windows Metafile (WMF), in ZIP format.
About this Graphic

Associated Planning Factors and Goals

Planning Factor Goal
B. Increase the safety of the transportation system for motorized and nonmotorized users; Improve the safety of the transportation system
G. Promote efficient system management and operation; Increase operational efficiency and reliability of the transportation system

Associated Objective Categories

Objective Category
Safety: Vehicle Crashes and Fatalities
System Efficiency: Travel Time

Associated Objectives and Performance Measures

Objective Performance Measure
Annual rate of change in regional average commute travel time will not exceed regional rate of population growth through the year Y. Average commute trip travel time (minutes).
Improve average travel time during peak periods by X percent by year Y. Average travel time during peak periods (minutes).
Reduce crashes due to driver errors and limitations Number of crashes and fatalities related to driver inattention and distraction
Reduce crashes due to driver errors and limitations Number of crashes and fatalities related to driving while intoxicated
Reduce crashes due to road weather conditions Number of crashes and fatalities related to weather conditions
Reduce crashes due to unexpected congestion Number of crashes and fatalities related to unexpected congestion
Reduce secondary crashes Number of secondary crashes
Reduce the total number of crashes in the region by X percent by year Y. Total crashes per X VMT.
Reduce the total number of fatalities and severe injuries in the region by X percent by year Y. Total fatalities per X VMT.
Reduce the total number of fatalities and severe injuries in the region by X percent by year Y. Total severe injuries per X VMT.

 
Since the mapping between objectives and service packages is not always straight-forward and often situation-dependent, these mappings should only be used as a starting point. Users should do their own analysis to identify the best service packages for their region.

Related ITS Applications of ITS Taxonomy

Classification Category ITS Application Area ITS Application(s)
Intelligent Infrastructure Crash Prevention & Safety Animal Warning
Intelligent Infrastructure Crash Prevention & Safety Road Geometry Warning Overheight/Overwidth Warning
Intelligent Infrastructure Road Weather Management Traffic Control - Control Strategies Vehicle Restrictions

User Services related to this Service Package:

User Service
1.6 Traffic Control
1.7 Incident Management

Transaction Set Diagram





The source graphic, a Windows Metafile (WMF), for the TSD can be downloaded here: TSD

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.

  1. 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.)

  2. 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.

  3. 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.

  4. 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).

  5. 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.

  6. The entire process is under the asynchronous monitoring (traffic operator data) and control (traffic operator inputs) of Traffic Operations Personnel.