Parent Service Package: PS03
< < PS03.2 : PS03.3 : PS03.4 > >

PS03.3: Center Control

Signal Preemption granted based on negotiation between the Emergency Management Center and Traffic Management Center

Relevant Regions: Australia, Canada, European Union, and United States

Enterprise

Development Stage Roles and Relationships

Installation Stage Roles and Relationships

Operations and Maintenance Stage Roles and Relationships
(hide)

Source Destination Role/Relationship
Emergency Management Center MaintainerEmergency Management Center Maintains
Emergency Management Center ManagerEmergency Management Center Manages
Emergency Management Center ManagerEmergency Personnel System Usage Agreement
Emergency Management Center OwnerEmergency Management Center Maintainer System Maintenance Agreement
Emergency Management Center OwnerEmergency Management Center Manager Operations Agreement
Emergency Management Center OwnerEmergency Personnel Application Usage Agreement
Emergency Management Center OwnerEmergency Vehicle OBE Maintainer Maintenance Data Exchange Agreement
Emergency Management Center OwnerEmergency Vehicle OBE Owner Information Exchange Agreement
Emergency Management Center OwnerEmergency Vehicle OBE User Service Usage Agreement
Emergency Management Center OwnerTraffic Management Center Maintainer Maintenance Data Exchange Agreement
Emergency Management Center OwnerTraffic Management Center Owner Information Exchange Agreement
Emergency Management Center OwnerTraffic Management Center User Service Usage Agreement
Emergency Management Center OwnerTraffic Operations Personnel Application Usage Agreement
Emergency Management Center SupplierEmergency Management Center Owner Warranty
Emergency PersonnelEmergency Management Center Operates
Emergency PersonnelEmergency Vehicle OBE Operates
Emergency PersonnelITS Roadway Equipment Operates
Emergency Vehicle OBE MaintainerEmergency Vehicle OBE Maintains
Emergency Vehicle OBE ManagerEmergency Personnel System Usage Agreement
Emergency Vehicle OBE ManagerEmergency Vehicle OBE Manages
Emergency Vehicle OBE OwnerEmergency Management Center Maintainer Maintenance Data Exchange Agreement
Emergency Vehicle OBE OwnerEmergency Management Center Owner Information Exchange Agreement
Emergency Vehicle OBE OwnerEmergency Management Center User Service Usage Agreement
Emergency Vehicle OBE OwnerEmergency Personnel Application Usage Agreement
Emergency Vehicle OBE OwnerEmergency Vehicle OBE Maintainer System Maintenance Agreement
Emergency Vehicle OBE OwnerEmergency Vehicle OBE Manager Operations Agreement
Emergency Vehicle OBE OwnerITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Emergency Vehicle OBE OwnerITS Roadway Equipment Owner Expectation of Data Provision
Emergency Vehicle OBE OwnerITS Roadway Equipment User Service Usage Agreement
Emergency Vehicle OBE SupplierEmergency Vehicle OBE Owner Warranty
ITS Roadway Equipment MaintainerITS Roadway Equipment Maintains
ITS Roadway Equipment ManagerEmergency Personnel System Usage Agreement
ITS Roadway Equipment ManagerITS Roadway Equipment Manages
ITS Roadway Equipment OwnerITS Roadway Equipment Maintainer System Maintenance Agreement
ITS Roadway Equipment OwnerITS Roadway Equipment Manager Operations Agreement
ITS Roadway Equipment OwnerTraffic Management Center Maintainer Maintenance Data Exchange Agreement
ITS Roadway Equipment OwnerTraffic Management Center Owner Information Exchange Agreement
ITS Roadway Equipment OwnerTraffic Management Center User Service Usage Agreement
ITS Roadway Equipment OwnerTraffic Operations Personnel Application Usage Agreement
ITS Roadway Equipment SupplierITS Roadway Equipment Owner Warranty
Traffic Management Center MaintainerTraffic Management Center Maintains
Traffic Management Center ManagerTraffic Management Center Manages
Traffic Management Center ManagerTraffic Operations Personnel System Usage Agreement
Traffic Management Center OwnerEmergency Management Center Maintainer Maintenance Data Exchange Agreement
Traffic Management Center OwnerEmergency Management Center Owner Information Exchange Agreement
Traffic Management Center OwnerEmergency Management Center User Service Usage Agreement
Traffic Management Center OwnerEmergency Personnel Application Usage Agreement
Traffic Management Center OwnerITS Roadway Equipment Maintainer Maintenance Data Exchange Agreement
Traffic Management Center OwnerITS Roadway Equipment Owner Information Exchange Agreement
Traffic Management Center OwnerITS Roadway Equipment User Service Usage Agreement
Traffic Management Center OwnerTraffic Management Center Maintainer System Maintenance Agreement
Traffic Management Center OwnerTraffic Management Center Manager Operations Agreement
Traffic Management Center SupplierTraffic Management Center Owner Warranty
Traffic Operations PersonnelTraffic Management Center Operates

Functional

This service package includes the following Functional View PSpecs:

Physical Object Functional Object PSpec Number PSpec Name
Emergency Management Center Emergency Routing 5.2 Provide Operator Interface for Emergency Data
5.3.6 Maintain Vehicle Status
5.3.7 Provide Emergency Vehicle Route
5.5 Update Emergency Display Map Data
5.7.1 Assess System Status For Disasters
5.7.3 Assess System Status For Evacuation
Emergency Vehicle OBE EV On-Board En Route Support 5.3.3 Provide Emergency Vehicle Location
5.3.5 Provide Emergency Personnel Interface
5.3.9 Process Mobile Emergency Requests
ITS Roadway Equipment Roadway Signal Control 1.1.1.1 Process Traffic Sensor Data
1.2.7.1 Process Indicator Output Data for Roads
1.2.7.13 Provide Device Interface for Field Management Stations
1.2.7.16 Process Signal Control Conflict Monitoring
1.2.7.2 Monitor Roadside Equipment Operation
1.2.7.8 Provide Device Interface to Other Roadway Devices
Roadway Signal Preemption 1.2.7.1 Process Indicator Output Data for Roads
1.2.7.2 Monitor Roadside Equipment Operation
1.2.7.3 Manage Local Signal Priority and Preemption Requests
Traffic Management Center TMC Signal Control 1.1.2.2 Process Traffic Data
1.1.2.5 Process Vehicle Situation Data
1.1.4.1 Retrieve Traffic Data
1.1.4.4 Manage Traffic Archive Data
1.1.5 Exchange Data with Other Traffic Centers
1.2.1 Select Strategy
1.2.2.2 Determine Indicator State for Road Management
1.2.4.1 Output Control Data for Roads
1.2.6.1 Maintain Traffic and Sensor Static Data
1.2.8 Collect Traffic Field Equipment Fault Data

Physical

The physical diagram can be viewed in SVG or PNG format and the current format is SVG.
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Display Legend in SVG or PNG

Includes Physical Objects:

Physical Object Class Description
Emergency Management Center Center The 'Emergency Management Center' represents systems that support incident management, disaster response and evacuation, security monitoring, and other security and public safety-oriented ITS applications. It includes the functions associated with fixed and mobile public safety communications centers including public safety call taker and dispatch centers operated by police (including transit police), fire, and emergency medical services. It includes the functions associated with Emergency Operations Centers that are activated at local, regional, state, and federal levels for emergencies and the portable and transportable systems that support Incident Command System operations at an incident. This Center also represents systems associated with towing and recovery, freeway service patrols, HAZMAT response teams, and mayday service providers. It manages sensor and surveillance equipment used to enhance transportation security of the roadway infrastructure (including bridges, tunnels, interchanges, and other key roadway segments) and the public transportation system (including transit vehicles, public areas such as transit stops and stations, facilities such as transit yards, and transit infrastructure such as rail, bridges, tunnels, or bus guideways). It provides security/surveillance services to improve traveler security in public areas not a part of the public transportation system. It monitors alerts, advisories, and other threat information and prepares for and responds to identified emergencies. It coordinates emergency response involving multiple agencies with peer centers. It stores, coordinates, and utilizes emergency response and evacuation plans to facilitate this coordinated response. Emergency situation information including damage assessments, response status, evacuation information, and resource information are shared The Emergency Management Center also provides a focal point for coordination of the emergency and evacuation information that is provided to the traveling public, including wide-area alerts when immediate public notification is warranted. It tracks and manages emergency vehicle fleets using real-time road network status and routing information from the other centers to aid in selecting the emergency vehicle(s) and routes, and works with other relevant centers to tailor traffic control to support emergency vehicle ingress and egress, implementation of special traffic restrictions and closures, evacuation traffic control plans, and other special strategies that adapt the transportation system to better meet the unique demands of an emergency.
Emergency Personnel Vehicle 'Emergency Personnel' represents personnel that are responsible for police, fire, emergency medical services, towing, service patrols, and other special response team (e.g., hazardous material clean-up) activities at an incident site. These personnel are associated with the Emergency Vehicle during dispatch to the incident site, but often work independently of the Emergency Vehicle while providing their incident response services.
Emergency Vehicle OBE Vehicle The 'Emergency Vehicle On-Board Equipment' (OBE) resides in an emergency vehicle and provides the processing, storage, and communications functions that support public safety-related connected vehicle applications. It represents a range of vehicles including those operated by police, fire, and emergency medical services. In addition, it represents other incident response vehicles including towing and recovery vehicles and freeway service patrols. It includes two-way communications to support coordinated response to emergencies. A separate 'Vehicle OBE' physical object supports the general vehicle safety and driver information capabilities that apply to all vehicles, including emergency vehicles. The Emergency Vehicle OBE supplements these general capabilities with capabilities that are specific to emergency vehicles.
ITS Roadway Equipment Field 'ITS Roadway Equipment' represents the ITS equipment that is distributed on and along the roadway that monitors and controls traffic and monitors and manages the roadway. This physical object includes traffic detectors, environmental sensors, traffic signals, highway advisory radios, dynamic message signs, CCTV cameras and video image processing systems, grade crossing warning systems, and ramp metering systems. Lane management systems and barrier systems that control access to transportation infrastructure such as roadways, bridges and tunnels are also included. This object also provides environmental monitoring including sensors that measure road conditions, surface weather, and vehicle emissions. Work zone systems including work zone surveillance, traffic control, driver warning, and work crew safety systems are also included.
Traffic Management Center Center The 'Traffic Management Center' monitors and controls traffic and the road network. It represents centers that manage a broad range of transportation facilities including freeway systems, rural and suburban highway systems, and urban and suburban traffic control systems. It communicates with ITS Roadway Equipment and Connected Vehicle Roadside Equipment (RSE) to monitor and manage traffic flow and monitor the condition of the roadway, surrounding environmental conditions, and field equipment status. It manages traffic and transportation resources to support allied agencies in responding to, and recovering from, incidents ranging from minor traffic incidents through major disasters.

Includes Functional Objects:

Functional Object Description Physical Object
Emergency Routing 'Emergency Routing' supports routing of emergency vehicles and enlists support from the Traffic Management Center to facilitate travel along these routes. Routes may be determined based on real-time traffic information and road conditions or routes may be provided by the Traffic Management Center on request. Vehicles are tracked and routes are based on current vehicle location. It may coordinate with the Traffic Management Center to provide preemption or otherwise adapt the traffic control strategy along the selected route. It may also coordinate with Transportation Information Centers to notify other drivers of public safety vehicles that are enroute. Emergency Management Center
EV On-Board En Route Support 'EV On-Board En Route Support' provides communications functions to responding emergency vehicles that reduce response times and improve safety of responding public safety personnel and the general public. It supports traffic signal preemption via short range communication directly with signal control equipment. Emergency Vehicle OBE
Roadway Signal Control 'Roadway Signal Control' includes the field elements that monitor and control signalized intersections. It includes the traffic signal controllers, detectors, conflict monitors, signal heads, and other ancillary equipment that supports traffic signal control. It also includes field masters, and equipment that supports communications with a central monitoring and/or control system, as applicable. The communications link supports upload and download of signal timings and other parameters and reporting of current intersection status. It represents the field equipment used in all levels of traffic signal control from basic actuated systems that operate on fixed timing plans through adaptive systems. It also supports all signalized intersection configurations, including those that accommodate pedestrians. In advanced, future implementations, environmental data may be monitored and used to support dilemma zone processing and other aspects of signal control that are sensitive to local environmental conditions. ITS Roadway Equipment
Roadway Signal Preemption 'Roadway Signal Preemption' includes the field elements that receive signal preemption requests from trains, boats (i.e., drawbridge crossings), emergency vehicles, or light rail transit vehicles approaching a signalized intersection and overrides the current operation of the traffic signals to stop conflicting traffic and grant right-of-way to the approaching vehicle. This functional object also services preemption requests received from a TMC to support implementations where the preemption requests are managed by the center. ITS Roadway Equipment
TMC Signal Control 'TMC Signal Control' provides the capability for traffic managers to monitor and manage the traffic flow at signalized intersections. This capability includes analyzing and reducing the collected data from traffic surveillance equipment and developing and implementing control plans for signalized intersections. Control plans may be developed and implemented that coordinate signals at many intersections under the domain of a single Traffic Management Center and are responsive to traffic conditions and adapt to support incidents, preemption and priority requests, pedestrian crossing calls, etc. Traffic Management Center

Includes Information Flows:

Information Flow Description
driver information Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation.
emergency personnel information presentation Presentation of information to emergency personnel in the field including dispatch information, incident information, current road network conditions, device status, and other supporting information.
emergency personnel input User input from emergency personnel in the field including dispatch coordination, incident status information, and remote device control requests.
emergency traffic control information Status of a special traffic control strategy or system activation implemented in response to an emergency traffic control request, a request for emergency access routes, a request for evacuation, a request to activate closure systems, a request to employ driver information systems to support public safety objectives, or other special requests. Identifies the selected traffic control strategy and system control status.
emergency traffic control request Special request to preempt the current traffic control strategy in effect at one or more signalized intersections or highway segments, activate traffic control and closure systems such as gates and barriers, activate safeguard systems, or use driver information systems. For example, this flow can request all signals to red-flash, request a progression of traffic control preemptions along an emergency vehicle route, request a specific evacuation traffic control plan, request activation of a road closure barrier system, or place a public safety or emergency-related message on a dynamic message sign.
emergency vehicle tracking data The current location and operating status of the emergency vehicle.
right-of-way request notification Notice that a request has occurred for signal prioritization, signal preemption, pedestrian call, multi-modal crossing activation, or other source for right-of-way.
signal control commands Control of traffic signal controllers or field masters including clock synchronization.
signal control status Operational and status data of traffic signal control equipment including operating condition and current indications.
suggested route Suggested route for a dispatched emergency or maintenance vehicle that may reflect current network conditions and the additional routing options available to en route emergency or maintenance vehicles that are not available to the general public.

Goals and Objectives

Associated Planning Factors and Goals

Planning Factor Goal

Associated Objective Categories

Objective Category

Associated Objectives and Performance Measures

Objective Performance Measure

 
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.

Needs and Requirements

Need Functional Object Requirement

Related Sources

Document Name Version Publication Date
None


Security

In order to participate in this service package, each physical object should meet or exceed the following security levels.

Physical Object Security
Physical Object Confidentiality Integrity Availability Security Class
Emergency Management Center Moderate High Moderate Class 3
Emergency Vehicle OBE Moderate High Moderate Class 3
ITS Roadway Equipment Moderate High Moderate Class 3
Traffic Management Center Moderate High Moderate Class 3



In order to participate in this service package, each information flow triple should meet or exceed the following security levels.

Information Flow Security
Source Destination Information Flow Confidentiality Integrity Availability
Basis Basis Basis
Emergency Management Center Emergency Vehicle OBE suggested route Moderate High Moderate
It is important for this route to be kept confidential to prevent everyone from attempting to travel this route. The emergency vehicle must receive an accurate Suggested Route. If the emergency vehicle is dispatched to an incorrect location it could lead to a significant delay in the vehicle responding to the emergency. This delay could lead to the loss of life or limb of a person. Therefore, if received, the suggested route must be trustworthy. The alternative to use of a Suggested Route is that drivers select the route themselves. Without the Suggested Route the driver may get stuck in traffic or behind an accident that slows down their response time. This is a degradation of the business service being provided, and could lead to an emergency vehicle not responding to an incident in the quickest manner.
Emergency Management Center Traffic Management Center emergency traffic control request Moderate High Moderate
These requests could be used to track the specific route that an emergency vehicle is planning on taking. False requests here could bring the traffic system to a standstill by making all of the lights red. Additionally, the system must be able to trust these requests, and know that they came from an authorized source. These messages are important for the system to operate properly. Additionally, the system must know if messages are not received so that it can act accordingly.
Emergency Personnel Emergency Vehicle OBE emergency personnel input Moderate Moderate Moderate
Some of the information, such as incident status information, is sensitive, and should be protected. The system must know that these requests came from actual Emergency Personal. Additionally, incorrect information here may lead to the system responding incorrectly to the incident These messages are important for the system to operate properly. Additionally, the system must know if messages are not received so that it can act accordingly.
Emergency Vehicle OBE Emergency Management Center emergency vehicle tracking data Moderate Moderate Moderate
Emergency Vehicles give obvious visual and audio indicators about their location and operating status. Knowing the location of every single emergency vehicle within a city could be extremely useful information to a criminal. Additionally, although this is observable data, it is transmitted on a regional level, which means that someone who is able to intercept it would be able to read the location of all emergency vehicles, not just the ones they could directly observed. A sufficiently motivated criminal can however get this information by other means. Incorrect data here could lead to incorrect decisions being made about the closure of lanes, or incorrect information being shared with the emergency vehicles. There should be other indicators that would contradict incorrect information transmitted here. This information may be used to determine which emergency vehicle is dispatched, and having this information available could lead to a quicker response from the emergency vehicle. However, the system would still be able to operate properly if only most messages make it through.
Emergency Vehicle OBE Emergency Personnel emergency personnel information presentation Moderate Moderate Moderate
Some of this information, such as incident information, is sensitive and should be protected. This information could affect how the Emergency Personnel respond to the event, and should be as accurate as possible. This information needs to be available for the Emergency Personnel in order for them to respond accurately to the system. If they do not acknowledge this information, dispatch needs to know, so they can attempt to contact the Emergency Personnel via another channel, such as radio.
ITS Roadway Equipment Emergency Personnel driver information Not Applicable High High
This data is sent to all drivers and is also directly observable, by design. This is the primary signal trusted by the driver to decide whether to go through the intersection and what speed to go through the intersection at; if it’s wrong, accidents could happen. If the lights are out you have to get a policeman to direct traffic – expensive and inefficient and may cause a cascading effect due to lack of coordination with other intersections.
ITS Roadway Equipment Traffic Management Center right-of-way request notification Low Moderate Moderate
This can be reasonably guessed based on observing the ITS RE’s environment. It is obvious when a bus approaches an intersection. Invalid messages could lead to an unauthorized user gaining signal priority at an intersection. This could also be used to delay traffic, which could lead to a financial impact on the community. However, the traffic signal will have controls in place to ensure that it does not display an illegal configuration (such as green in every direction). Even if all of the Right-of-way Requests are not passed along from an ITS RE, the intersection will still operate as normal. There are other existing methods to assist a right-of-way requesting vehicle safely traveling through an intersection, such as lights and sirens, which prevent this from being a HIGH. DISC: THEA and NYC believe this to be LOW: "not necessary for the app to work; can cope with not having immediately available data"
ITS Roadway Equipment Traffic Management Center signal control status Low High Moderate
The current conditions of an ITS RE are completely observable, by design. This influences the TMC response to a right-of-way request. It should be as accurate as the right-of-way request themselves. For some applications (ISIG) this need only be moderate. Per THEA: info needs to be accurate and should not be tampered to enable effective monitoring and control by the TMC. DISC: THEA believes this to be MODERATE: "info needs to be accurate and should not be tampered to enable effective monitoring and control by the TMC; should be as accurate as the right of way request". NYC:TMC doesn’t play an active role in this application, i.e. even if the information contained in this flow were incorrect, it is unlikely to affect the outcome of this application one way or the other. On some applications NYC has this MODERATE though. RES: This value can obviously change a lot depending on the application context. The TMC will need the current status of the ITS RE in order to make an educated decision. If it is unavailable, the system is unable to operate. However, a few missed messages will not have a catastrophic impact. From NYC: TMC doesn’t play an active role in this application, i.e. even if it is unavailable, it is unlikely to affect the outcome of this application one way or the other. RES: This value can change a lot depending on the application context.
Traffic Management Center Emergency Management Center emergency traffic control information Moderate High Moderate
This can potentially include sensitive information, such as response information to emergencies. Invalid messages could lead to an unauthorized user gaining transit signal priority at an intersection. This could also be used to bring traffic to a standstill, which could lead to a large financial impact on the community. These messages are important to help with the transit signal priority application. Without them, it will not work. However, if these signals are not received, the Emergency Vehicle can still navigate through the intersection using Lights and Sirens. The TMC should have an acknowledgement of the receipt of a message.
Traffic Management Center ITS Roadway Equipment signal control commands Moderate High Moderate
Control flows, even for seemingly innocent devices, should be kept confidential to minimize attack vectors. While an individual installation may not be particularly impacted by a cyberattack of its sensor network, another installation might be severely impacted, and different installations are likely to use similar methods, so compromising one leads to compromising all. DISC: NYC believes this to be LOW: "The result of this will be directly observable." Invalid messages could lead to an unauthorized user gaining control of an intersection. This could also be used to bring traffic to a standstill, which could lead to a large financial impact on the community. DISC: NYC believes this to be MODERATE: The signal timing is critical to the intersection operation; incorrect signal timing can lead to significant congestion and unreliable operation; while unsafe operation is controlled by the cabinet monitoring system, attackers could “freeze” the signal or call a preemption. RES: This will vary depending on the application and implementation. These messages are important to help with preemption and signal priority applications. Without them, these applications mayl not work. However, if these signals are not received, the ITS RE will continue to function using its default configuration. The TMC should have an acknowledgement of the receipt of a message. DISC: NYC blieves this to be LOW: TMC doesn’t play an active role in this application, i.e. even if it is unavailable, it is unlikely to affect the outcome of this application one way or the other. RES: This will vary depending on the application and implementation.

Standards

The following table lists the standards associated with physical objects in this service package. For standards related to interfaces, see the specific information flow triple pages. These pages can be accessed directly from the SVG diagram(s) located on the Physical tab, by clicking on each information flow line on the diagram.

NameTitlePhysical Object
ITE 5201 ATC Advanced Transportation Controller ITS Roadway Equipment
ITE 5202 ATC Model 2070 Model 2070 Controller Standard ITS Roadway Equipment
ITE 5301 ATC ITS Cabinet Intelligent Transportation System Standard Specification for Roadside Cabinets ITS Roadway Equipment
ITE 5401 ATC API Application Programming Interface Standard for the Advanced Transportation Controller ITS Roadway Equipment
NEMA TS 8 Cyber and Physical Security Cyber and Physical Security for Intelligent Transportation Systems ITS Roadway Equipment
Traffic Management Center
NEMA TS2 Traffic Controller Assemblies Traffic Controller Assemblies with NTCIP Requirements ITS Roadway Equipment




System Requirements

No System Requirements