Traffic Management Center --> ITS Roadway Equipment:
mixed use safety warning control
Definitions
mixed use safety warning control (Information Flow): Configuration and control of equipment that monitors and manages mixed use crossings and provides visual displays and warnings to drivers when non-motorized users are occupying a cross walk or other mixed use path crossing.
Traffic Management Center (Source Physical Object): 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.
ITS Roadway Equipment (Destination Physical Object): '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.
Included In
This Triple is in the following Service Packages:
This Triple is described by the following Functional View Functional Objects:
This Triple is described by the following Functional View Data Flows:
This Triple has the following triple relationships:
| Relationship | Source | Destination | Flow |
|---|---|---|---|
| Interactive | ITS Roadway Equipment | Traffic Management Center | mixed use safety warning status |
Communication Solutions
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US: NTCIP Traffic Signal - SNMPv3/TLS (8)
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US: NTCIP Traffic Signal - SNMPv1/TLS (9)
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(None-Data) - Secure Internet (ITS) (32)
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US: NTCIP Traffic Signal - SNMPv1 (35)
Selected Solution
US: NTCIP Traffic Signal - SNMPv3/TLSSolution Description
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ITS Application Entity
NTCIP 1202  |
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Mgmt
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Facilities
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Security
IETF RFC 6353 |
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TransNet
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Access
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Note that some layers might have alternatives, in which case all of the gap icons associated with every alternative may be shown on the diagram, but the solution severity calculations (and resulting ordering of solutions) includes only the issues associated with the default (i.e., best, least severe) alternative.
Characteristics
| Characteristic | Value |
|---|---|
| Time Context | Recent |
| Spatial Context | Local |
| Acknowledgement | True |
| Cardinality | Unicast |
| Initiator | Source |
| Authenticable | True |
| Encrypt | True |
| Interoperability | Description |
|---|---|
| Local | In cases where an interface is normally encapsulated by a single stakeholder, interoperability is still desirable, but the motive is vendor independence and the efficiencies and choices that an open standards-based interface provides. |
Security
| Information Flow Security | ||||
|---|---|---|---|---|
| Confidentiality | Integrity | Availability | ||
| Rating | Moderate | Moderate | Low | |
| Basis | Application configuration: The displays and warnings on the controlled device are not confidential, so messages containing possible displays and warnings or setting the conditions under which they are displayed should not be confidential. O Device management: If this information flow includes device management as well as display and alert configuration, the device management may include proprietary information about the particular device being managed such as firmware details, memory size, processor limitations etc. The confidentiality requirement for the roadway equipment should be set by the supplier based on their understanding of the confidentiality requirements of the management messages. Note that the supplier can be assumed to provide devices that meet their own security requirements; however, the confidentiality requirements of this flow will also apply to the TMC. |
Fake instances of this information flow can cause drivers and pedestrians to get incorrect information. However, it would not be possible to put the traffic signal into an inconsistent. DISC: THEA and NYC believe this should be HIGH: proprietary info that should not be tampered with; equipment monitors and manages pedestrian crossings and provides visual displays and warnings | Control flow availability is related to the criticality of being able to remotely control the device. For most devices, this is MODERATE. For purely passive devices with no incident relationship, this will be LOW. All devices should have default modes that enable them to operate without backhaul connectivity, so no device warrants a HIGH. Assuming that the traffic signal is configured reasonably well to start off with, the system should be robust if it goes an arbitrary amount of time without reconfiguration. | |
| Security Characteristics | Value |
|---|---|
| Authenticable | True |
| Encrypt | True |