ITS Roadway Equipment --> Connected Vehicle Roadside Equipment:
conflict monitor status

Definition
Included In
Communication Solutions
Characteristics
Security

Definitions

conflict monitor status (Information Flow): A control flow that supports failsafe operation in the event that a conflict is detected that requires the RSE to enter a failsafe operating mode for intersection management. Analogous to a traffic signal conflict monitor, this flow is issued when differences are detected between information provided to the vehicle for in-vehicle display and information displayed by field devices. It contains the details of differences that were found.

ITS Roadway Equipment (Source 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.

Connected Vehicle Roadside Equipment (Destination Physical Object): 'Connected Vehicle Roadside Equipment' (CV RSE) represents the Connected Vehicle roadside devices that are used to send messages to, and receive messages from, nearby vehicles using Dedicated Short Range Communications (DSRC) or other alternative wireless communications technologies. Communications with adjacent field equipment and back office centers that monitor and control the RSE are also supported. This device operates from a fixed position and may be permanently deployed or a portable device that is located temporarily in the vicinity of a traffic incident, road construction, or a special event. It includes a processor, data storage, and communications capabilities that support secure communications with passing vehicles, other field equipment, and centers.

Included In

This Triple is in the following Service Packages:

This triple is associated with the following Functional Objects:

This Triple is described by the following Functional View Data Flows:

roadside_signal_phase_indication

This Triple has the following triple relationships:

None

Communication Solutions

US: NTCIP Traffic Signal - SNMPv3/TLS (5)
(None-Data) - Secure Internet (ITS) (32)

Solutions are sorted in ascending Gap Severity order. The Gap Severity is the parenthetical number at the end of the solution.

Selected Solution

US: NTCIP Traffic Signal - SNMPv3/TLS

Solution Description

This solution is used within the U.S.. It combines standards associated with US: NTCIP Traffic Signal with those for I-F: SNMPv3/TLS. The US: NTCIP Traffic Signal standards include upper-layer standards required to implement center-to-field traffic signal communications. The I-F: SNMPv3/TLS standards include lower-layer standards that support secure center-to-field and field-to-field communications using simple network management protocol (SNMPv3); implementations are strongly encouraged to use the TLS for SNMP security option for this solution to ensure adequate security.

ITS Application Entity NTCIP 1202			Click gap icons for more info.
Mgmt NTCIP 1201 Bundle: SNMPv3 MIB	Facilities NTCIP 1202 ISO 15784-2	Security IETF RFC 6353
	TransNet IP Alternatives Internet Transport Alternatives
	Access Field SubNet Alternatives

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	Now
Spatial Context	Adjacent
Acknowledgement	False
Cardinality	Unicast
Initiator	Source
Authenticable	True
Encrypt	False

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	Low	High	Moderate
Basis	This information could be ascertained by examining the signal states, and so is effectively broadcast. From NYC: This flow tells the RSE that the traffic controller is in a failed state – typically flashing signals not timing.	If this is compromised, it could send incorrect data to the RSE. Since the data contained herein directly affects human safety, the RSE may react to modify its outputs, at the least disabling related outputs. if compromised, the ITS RE may not be able to support failsafe operating mode in the event of a conflict between the ITS RE and RSE. May not be 'High' because the signal state is also present. From NYC: This flow tells the RSE that the traffic controller is in a failed state – typically flashing signals not timing.	A delay in reporting this may allow the RSE to distribute faulty information, but that information is contradicted by the signal state. Since there are multiple pathways for the information to be obtained, this is not 'High.'

Security Characteristics	Value
Authenticable	True
Encrypt	False

ITS Roadway Equipment --> Connected Vehicle Roadside Equipment:conflict monitor status