Connected Vehicle Roadside Equipment --> Emergency Vehicle OBE:
intersection status

Definition
Included In
Communication Solutions
Characteristics
Security

Definitions

intersection status (Information Flow): Current signal phase and timing information for all lanes at a signalized intersection. This flow identifies active lanes and lanes that are being stopped and specifies the length of time that the current state will persist for each lane. It also identifies signal priority and preemption status and pedestrian crossing status information where applicable.

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.

Emergency Vehicle OBE (Destination Physical Object): The Emergency Vehicle On-Board Equipment (OBE) resides in an emergency vehicle and provides the processing, storage, and communications functions that support public safety-related connected vehicle applications. It represents a range of vehicles including those operated by police, fire, and emergency medical services. In addition, it represents other incident response vehicles including towing and recovery vehicles and freeway service patrols. It includes two-way communications to support coordinated response to emergencies. A separate 'Vehicle OBE' physical object supports the general vehicle safety and driver information capabilities that apply to all vehicles, including emergency vehicles. The Emergency Vehicle OBE supplements these general capabilities with capabilities that are specific to emergency vehicles.

Included In

This Triple is in the following Service Packages:

PS03: Emergency Vehicle Preemption

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:

None

Communication Solutions

EU: Signal Control Messages - BTP/GeoNetworking/G5 (12)
US: SAE Signal Control Messages - LTE-V2X WSMP (18)
US: SAE Signal Control Messages - WAVE WSMP (20)

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

Selected Solution

US: SAE Signal Control Messages - WAVE WSMP

Solution Description

This solution is used within the U.S.. It combines standards associated with US: SAE Signal Control Messages with those for V-X: WAVE WSMP. The US: SAE Signal Control Messages standards include upper-layer standards required to implement signal control information flows. The V-X: WAVE WSMP standards include lower-layer standards that support connectionless, near constant, ultra-low latency vehicle-to-any communications within ~300m using the WAVE Short Messaging Protocol (WSMP) over IEEE WAVE in the 5.9GHz spectrum. The broadcast mode is interoperable with M5 FNTP.

ITS Application Entity SAE J2735 CEN ISO 19091 SAE J2945/B CTI 4501			Click gap icons for more info.
Mgmt Addressed Elsewhere	Facilities SAE J2735 SAE J2945	Security Bundle: IEEE 1609.2
	TransNet IEEE 1609.3
	Access Bundle: WAVE - Subnet

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	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	Not Applicable	Moderate	Moderate
Basis	This data is intended for all vehicles in the immediate area of the sender.	If an emergency vehicle approaches an intersection at HIGH speed and is informed that it's safe to proceed when in fact cars on the cross street are proceeding themselves, the emergency vehicle could run the lights and get into an accident. We consider this a higher risk than the risk that a typical driver will get into a serious accident because the emergency vehicle may well be going at a higher speed. However, emergency vehicle drivers are trained professionals, and the emergency vehicle will likely also have its siren on, alerting vehicles on the cross street, so even though the risk is slightly higher than for non-emergency vehicles we do not consider the risk to life and limb to be direct enough to justify a HIGH rating.	Compared to regular drivers, emergency vehicle drivers are assumed to be more alert and so are less likely to make bad driving decisions on the basis of missing messages; however, if they do make bad driving decisions, the consequences are more serious, so the overall requirement level stays at a MEDIUM.

Security Characteristics	Value
Authenticable	True
Encrypt	False

Connected Vehicle Roadside Equipment --> Emergency Vehicle OBE:intersection status