ITS Roadway Equipment --> Other ITS Roadway Equipment:
roadway warning coordination

This triple is bi-directional. See also Other ITS Roadway Equipment --> ITS Roadway Equipment: roadway warning coordination

Definition
Included In
Communication Solutions
Characteristics
Security

Definitions

roadway warning coordination (Information Flow): The direct flow of information between field equipment. This includes information used to configure and control roadway warning systems and the current operating status of roadway warning systems.

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.

Other ITS Roadway Equipment (Destination Physical Object): Representing another set of ITS Roadway Equipment, 'Other ITS Roadway Equipment' supports 'field device' to 'field device' communication and coordination, and provides a source and destination for information that may be exchanged between ITS Roadway Equipment. The interface enables direct coordination between field equipment. Examples include the direct interface between sensors and other roadway devices (e.g., Dynamic Message Signs) and the direct interface between roadway devices (e.g., between a Signal System Master and Signal System Local equipment) or a connection between an arterial signal system master and a ramp meter controller.

Included In

This Triple is in the following Service Packages:

TM12: Dynamic Roadway Warning

This triple is associated with the following Functional Objects:

Roadway Warning

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

This Triple has the following triple relationships:

Relationship	Source	Destination	Flow
Request-Response	Other ITS Roadway Equipment	ITS Roadway Equipment	roadway warning coordination

Communication Solutions

US: NTCIP Warning Device - SNMPv3/TLS (5)
US: NTCIP Warning Device - SNMPv1/TLS (6)
US: NTCIP Warning Device - SNMPv1 (32)
(None-Data) - Secure Internet (ITS) (43)

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 Warning Device - SNMPv1/TLS

Solution Description

This solution is used within Canada and the U.S.. It combines standards associated with US: NTCIP Warning Device with those for I-F: SNMPv1/TLS. The US: NTCIP Warning Device standards include a composite of upper-layer standards that support monitoring for unsafe traffic activities and displaying warning to drivers. The I-F: SNMPv1/TLS standards include lower-layer standards that define one way to retrofit basic security into SNMPv1 implementations (mainly in the US); however, this only secures the communications link and does not provide end-application security and is not recommended for new deployments.

ITS Application Entity NTCIP 1203 NTCIP 1205 NTCIP 1209			Click gap icons for more info.
Mgmt NTCIP 1201 Bundle: SNMPv1 MIB	Facilities NTCIP 1203 NTCIP 1205 NTCIP 1209 NTCIP 2301	Security IETF RFC 8446
	TransNet IP Alternatives IETF RFC 9293
	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	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	Moderate
Basis	Any control flow has some confidentiality requirement, as observation of the flow may enable an attacker to analyze and learn how to assume control. MODERATE for most flows as the potential damage is likely contained, though anything that could have a significant safety impact may be assigned HIGH.	Since this directly impacts device control, we consider it the same as a control flow. Control flows, even for seemingly innocent devices, should have MODERATE integrity at minimum, just to guarantee that intended control messages are received. Incorrect, corrupted, intercepted and modified control messages can or will result in target field devices not behaving according to operator intent. The severity of this depends on the type of device, which is why some devices are set MODERATE and some HIGH.	Since this directly impacts device control, we consider it the same as a control flow. 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.

Security Characteristics	Value
Authenticable	True
Encrypt	True

ITS Roadway Equipment --> Other ITS Roadway Equipment:roadway warning coordination