ITS Roadway Equipment --> Connected Vehicle Roadside Equipment:
intersection control status
Definitions
intersection control status (Information Flow): Status data provided by the traffic signal controller including phase information, alarm status, and priority/preempt status.
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:
- CVO06: Freight Signal Priority
- MC11: Maintenance and Construction Signal Priority
- PS03: Emergency Vehicle Preemption
- PT09: Transit Signal Priority
- ST02: Eco-Traffic Signal Timing
- ST08: Eco-Approach and Departure at Signalized Intersections
- TM04: Connected Vehicle Traffic Signal System
- VS12: Vulnerable Road User Safety
- VS13: Intersection Safety Warning and Collision Avoidance
- VS15: Infrastructure Enhanced Cooperative Adaptive Cruise Control
This triple is associated with the following Functional Objects:
- Roadway Mixed Use Crossing Safety
- Roadway Signal Control
- RSE Intersection Management
- RSE Intersection Safety
This Triple is described by the following Functional View Data Flows:
- roadside_signal_phase_indication
- roadside_signal_phase_response_state
- roadside_signal_phase_timing
- roadside_signal_priority_preempt
- traffic_metering_data_for_roadside
This Triple has the following triple relationships:
| None |
Communication Solutions
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US: NTCIP Traffic Signal - SNMPv3/TLS (8)
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(None-Data) - Secure Internet (ITS) (32)
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Data for Distribution (TBD) - Apache Kafka (36)
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Data for Distribution (TBD) - OMG DDS (36)
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Data for Distribution (TBD) - OASIS MQTT (42)
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Data for Distribution (TBD) - OASIS AMQP (45)
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 | Adjacent |
| Acknowledgement | False |
| Cardinality | Unicast |
| Initiator | Destination |
| 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 data is intentionally transmitted to everyone via a broadcast. It can also be determined via other visual indicators. | If this is compromised, the Roadway Equipment and Roadside Equipment will be sending messages that are inconsistent with each other, leading to confusion and possible accidents. | If this is down, the RSE doesn't get the information it needs to stay in synch with the actual signal state, reducing or eliminating the value add from having this application. The RSE must detect a lack of availability and choose not to send out-of-date information, so a failure of availability could be interpreted as having the same value as Integrity. However, this data is semi-predictable and there are other indicators (such as the lights themselves) of the intersection status. From NYC, who believe this should be HIGH for some applications: If this is down, the RSE doesn't get the information it needs to stay in synch with the actual signal state, reducing or eliminating the value add from having this application. The RSE must detect a lack of availability and choose not to send out-of-date information, so a failure of availability cannot have worse consequences than a failure of integrity which we have previously assessed at HIGH. |
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| Security Characteristics | Value |
|---|---|
| Authenticable | True |
| Encrypt | False |