Connected Vehicle Roadside Equipment --> Vehicle:
reduced speed notification

Definitions

reduced speed notification (Information Flow): Reduced speed zone information provided to passing vehicles. This flow provides the reduced speed limit, the location and extent of the reduced speed zone, and associated warning information.

Connected Vehicle Roadside Equipment (Source 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.

Vehicle (Destination Physical Object): This 'Vehicle' physical object is used to model core capabilities that are common to more than one type of Vehicle. It provides the vehicle-based general sensory, processing, storage, and communications functions that support efficient, safe, and convenient travel. Many of these capabilities (e.g., see the Vehicle Safety service packages) apply to all vehicle types including personal vehicles, commercial vehicles, emergency vehicles, transit vehicles, and maintenance vehicles. From this perspective, the Vehicle includes the common interfaces and functions that apply to all motorized vehicles. The radio(s) supporting V2V and V2I communications are a key component of the Vehicle. Both one-way and two-way communications options support a spectrum of information services from basic broadcast to advanced personalized information services. Advanced sensors, processors, enhanced driver interfaces, and actuators complement the driver information services so that, in addition to making informed mode and route selections, the driver travels these routes in a safer and more consistent manner. This physical object supports all six levels of driving automation as defined in SAE J3016. Initial collision avoidance functions provide 'vigilant co-pilot' driver warning capabilities. More advanced functions assume limited control of the vehicle to maintain lane position and safe headways. In the most advanced implementations, this Physical Object supports full automation of all aspects of the driving task, aided by communications with other vehicles in the vicinity and in coordination with supporting infrastructure subsystems.

Communication Solutions

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

Selected Solution

EU: Contextual Speed Information Service - BTP/GeoNetworking/G5

Solution Description

This solution is used within Australia and the E.U.. It combines standards associated with EU: Contextual Speed Information Service with those for V-X: BTP/GeoNetworking/G5. The EU: Contextual Speed Information Service standards include upper-layer standards that support for providing speed information to a vehicle from roadside infrastructure. The V-X: BTP/GeoNetworking/G5 standards include lower-layer standards that support broadcast, near constant, low latency vehicle-to-vehicle and vehicle-to-infrastructure communications using the ETSI GeoNetworking Bundle over the 5.9GHz spectrum.

Mind the gap
ITS Application Entity
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CEN ISO 19321
CEN ISO 17426
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Mgmt
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ETSI 302 890-1
Addressed Elsewhere
Facilities

CEN ISO 14823
Security
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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 Broadcast
Initiator Source
Authenticable True
Encrypt False


Interoperability Description
National This triple should be implemented consistently within the geopolitical region through which movement is essentially free (e.g., the United States, the European Union).

Security

Information Flow Security
  Confidentiality Integrity Availability
Rating Low Moderate Moderate
Basis Seeing the broadcasted message on current reduced speed limit should not cause harm as this is sent to all nearby vehicles to notify of reduced speed limits message should not be tampered with; could increase physical risk to the driver and other drivers on the road if not warned with the correct information need immediate availability for the driver to react but cannot guarantee wireless communication


Security Characteristics Value
Authenticable True
Encrypt False