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SU05: Location and Time

This service package identifies the external systems and interfaces that provide accurate location and time to intelligent transportation system devices and systems.

Relevant Regions: Australia, Canada, European Union, and United States

Enterprise

Development Stage Roles and Relationships

Installation Stage Roles and Relationships

Operations Stage Roles and Relationships
(hide)

Source Destination Role/Relationship
Basic Vehicle Manager Basic Vehicle Manages
Basic Vehicle Owner Basic Vehicle Owns
Basic Vehicle Owner Basic Vehicle Manager Operations Agreement
Basic Vehicle Owner Vehicle OBE Owner Expectation of Data Provision
Basic Vehicle Supplier Basic Vehicle Owner Warranty
Center Manager Center Manages
Center Owner Center Owns
Center Owner Center Manager Operations Agreement
Center Supplier Center Owner Warranty
Connected Vehicle Roadside Equipment Manager Connected Vehicle Roadside Equipment Manages
Connected Vehicle Roadside Equipment Owner Connected Vehicle Roadside Equipment Owns
Connected Vehicle Roadside Equipment Owner Connected Vehicle Roadside Equipment Manager Operations Agreement
Connected Vehicle Roadside Equipment Owner Personal Information Device Owner Expectation of Information Provision
Connected Vehicle Roadside Equipment Owner Personnel Device Owner Expectation of Information Provision
Connected Vehicle Roadside Equipment Owner Vehicle OBE Owner Expectation of Information Provision
Connected Vehicle Roadside Equipment Supplier Connected Vehicle Roadside Equipment Owner Warranty
Data Distribution System Manager Data Distribution System Manages
Data Distribution System Owner Data Distribution System Owns
Data Distribution System Owner Data Distribution System Manager Operations Agreement
Data Distribution System Supplier Data Distribution System Owner Warranty
ITS Roadway Equipment Manager ITS Roadway Equipment Manages
ITS Roadway Equipment Owner ITS Roadway Equipment Owns
ITS Roadway Equipment Owner ITS Roadway Equipment Manager Operations Agreement
ITS Roadway Equipment Supplier ITS Roadway Equipment Owner Warranty
Location and Time Data Source Manager Location and Time Data Source Manages
Location and Time Data Source Owner Location and Time Data Source Owns
Location and Time Data Source Owner Location and Time Data Source Manager Operations Agreement
Location and Time Data Source Supplier Location and Time Data Source Owner Warranty
Network Time Source Manager Network Time Source Manages
Network Time Source Owner Center Owner Information Provision Agreement
Network Time Source Owner Data Distribution System Owner Information Provision Agreement
Network Time Source Owner Network Time Source Owns
Network Time Source Owner Network Time Source Manager Operations Agreement
Network Time Source Owner Service Monitor System Owner Information Provision Agreement
Network Time Source Supplier Network Time Source Owner Warranty
Personal Information Device Manager Personal Information Device Manages
Personal Information Device Owner Personal Information Device Owns
Personal Information Device Owner Personal Information Device Manager Operations Agreement
Personal Information Device Supplier Personal Information Device Owner Warranty
Personnel Device Manager Personnel Device Manages
Personnel Device Owner Personnel Device Owns
Personnel Device Owner Personnel Device Manager Operations Agreement
Personnel Device Supplier Personnel Device Owner Warranty
Position Corrections Source Manager Position Corrections Source Manages
Position Corrections Source Owner Position Corrections Source Owns
Position Corrections Source Owner Position Corrections Source Manager Operations Agreement
Position Corrections Source Supplier Position Corrections Source Owner Warranty
Service Monitor System Manager Service Monitor System Manages
Service Monitor System Manager Service Monitor System Operator System Usage Agreement
Service Monitor System Operator Service Monitor System Operates
Service Monitor System Owner Center Owner Information Provision Agreement
Service Monitor System Owner Data Distribution System Owner Information Provision Agreement
Service Monitor System Owner Service Monitor System Owns
Service Monitor System Owner Service Monitor System Manager Operations Agreement
Service Monitor System Supplier Service Monitor System Owner Warranty
Vehicle OBE Manager Vehicle OBE Manages
Vehicle OBE Owner Vehicle OBE Owns
Vehicle OBE Owner Vehicle OBE Manager Operations Agreement
Vehicle OBE Supplier Vehicle OBE Owner Warranty

Maintenance Stage Roles and Relationships

Physical

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Includes Physical Objects:

Physical Object Class Description
Basic Vehicle Vehicle 'Basic Vehicle' represents a complete operating vehicle. It includes the vehicle platform that interfaces with and hosts ITS electronics and all of the driver convenience and entertainment systems, and other non-ITS electronics on-board the vehicle. Interfaces represent both internal on-board interfaces between ITS equipment and other vehicle systems and other passive and active external interfaces or views of the vehicle that support vehicle/traffic monitoring and management. External interfaces may also represent equipment that is carried into the vehicle (e.g., a smartphone that is brought into the vehicle). Internal interfaces are often implemented through a vehicle databus, which is also included in this object. Note that 'Vehicle' represents the general functions and interfaces that are associated with personal automobiles as well as commercial vehicles, emergency vehicles, transit vehicles, and other specialized vehicles.
Center Center This general physical object is used to model core capabilities that are common to any center.
Connected Vehicle Roadside Equipment Field '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.
Data Distribution System Support The 'Data Distribution System' collects, processes, and distributes ITS data, connecting data producers with data consumers and facilitating data exchange.
ITS Roadway Equipment Field '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.
Location and Time Data Source ITS The 'Location and Time Data Source' provides accurate position information. While a Global Positioning System (GPS) Receiver is the most common implementation, this physical object represents any technology that provides a position fix in three dimensions and time with sufficient accuracy.
Network Time Source Support The 'Network Time Source' represents the external time source the Connected Vehicle Service Monitor System uses as the basis for time. This is likely implemented as a Stratum-2 Network Time Server that is 2 steps removed from a basic time source (e.g., atomic clock).
Personal Information Device Personal The 'Personal Information Device' provides the capability for travelers to receive formatted traveler information wherever they are. Capabilities include traveler information, trip planning, and route guidance. Frequently a smart phone, the Personal Information Device provides travelers with the capability to receive route planning and other personally focused transportation services from the infrastructure in the field, at home, at work, or while en-route. Personal Information Devices may operate independently or may be linked with connected vehicle on-board equipment.
Personnel Device Personal 'Personnel Device' represents devices used by emergency personnel or maintenance and construction personnel in the field. In the case of emergency personnel, the devices would include body cameras or smartphones (and their peripherals) that can be used by emergency personnel to provide images or video as well as send or receive data regarding the incident. The devices could also be used for incident scene safety messages to the personnel. In the case of maintenance and construction field personnel, the devices could be cellular phones or specialized safety devices that would be used for work zone safety messages to the personnel.
Position Corrections Source Support The 'Position Corrections Source' represents the external source of land-based position corrections that augment satellite-provided (e.g., GPS) positioning data.
Service Monitor System Support The 'Service Monitor System' represents one or more center-based systems that provide monitoring, management and control services necessary to other applications and/or devices operating within the Connected Vehicle Environment. These support services enable other applications to provide transportation services.
Service Monitor System Operator Support The 'Service Monitor System Operator' represents the person or people that monitor and manage the Service Monitor System.
Vehicle OBE Vehicle The Vehicle On-Board Equipment (OBE) provides the vehicle-based sensory, processing, storage, and communications functions that support efficient, safe, and convenient travel. The Vehicle OBE includes general capabilities that apply to passenger cars, trucks, and motorcycles. 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 OBE 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 OBE. Both one-way and two-way communications options support a spectrum of information services from basic broadcast to advanced personalized information services. Route guidance capabilities assist in formulation of an optimal route and step by step guidance along the travel route. 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.

Includes Functional Objects:

Functional Object Description Physical Object
Center Support Services 'Center Support Services' provides foundational functions that support data collection, management, location reference, timing, and data distribution. It maintains precise location and time information to support other services. Center
DDS Support Services 'DDS Support Services' provides foundational functions that support data collection, management, timing, and data distribution. It coordinates with Support subsystems to maintain necessary registrations with respect to location and scope. Data Distribution System
Personal Location Determination 'Personal Location Determination' receives current location information and provides this information to other applications that use the location information to provide guidance and emergency notification services. It interfaces with and encapsulates positioning technology such as a GPS receiver that is embedded in the user's device. Personal Information Device
Personnel Location Determination 'Personnel Location Determination' receives current location information and provides this information to other applications that use the location information to support incident response, road maintenance, and other activities where personnel locations are monitored for safety and coordination. It interfaces with and encapsulates positioning technology such as a GPS receiver that is embedded in the user's device. Personnel Device
Roadway Time Management 'Roadway Time Management' provides foundational time keeping functionality that supports an accurate, synchronized time reference in ITS field equipment. It receives accurate time information from an external source and maintains a local time reference using an internal clock in between time synchronizations. ITS Roadway Equipment
RSE Position Correction Support 'RSE Position Correction Support' broadcasts differential positioning data to enable precise locations to be determined by passing vehicles, supporting Connected Vehicle applications that require highly accurate positioning. The differential positioning data may be calculated directly by a precisely located RSE that is operating as a reference station or received from an external reference station and relayed to passing vehicles. Connected Vehicle Roadside Equipment
RSE Support Services 'RSE Support Services' provides foundational functions that support data collection, management, location reference, timing, and data distribution. It coordinates with Support subsystems to maintain necessary registrations with respect to location and scope. It maintains precise location and time information to support other services. Connected Vehicle Roadside Equipment
SM Time Synchronization 'SM Time Synchronization' provides the functions necessary to receive accurate time from an external Network Time Server and provide that Coordinated Universal Time (UTC) as Time Local Form to other center systems and field devices. Service Monitor System
Vehicle Location Determination 'Vehicle Location Determination' receives current location of the vehicle and provides this information to vehicle applications that use the location information to provide ITS services. Vehicle OBE

Includes Information Flows:

Information Flow Description
host vehicle status Information provided to the ITS on-board equipment from other systems on the vehicle platform. This includes the current status of the powertrain, steering, and braking systems, and status of other safety and convenience systems. In implementations where GPS is not integrated into the Vehicle On-Board Equipment, the host vehicle is also the source for data describing the vehicle's location in three dimensions (latitude, longitude, elevation) and accurate time that can be used for time synchronization across the ITS environment.
location and time The current geographic location in three dimensions (latitude, longitude, elevation) and the current time.
location correction Information provided to improve positional accuracy. These corrections allow a mobile GPS receiver, such as a GPS system in a connected vehicle, to achieve a
greater absolute positional accuracy, compensating for errors that exist in satellite positioning.
position corrections Ground based reference station positioning corrections
service monitor information presentation Presentation of information to the System Monitoring Operator including current operational status of the System Monitoring function and the connected vehicle environment that is monitored.
service monitor operator input User input from the SMS operator including requests to monitor current system operation and inputs to affect system operation.
time Current time expressed in Universal Time Coordinated (UTC) format from a Stratum-2 time server.
time local form Time local form includes UTC time synchronized with the external source in a format usable by connected vehicle center functions.

Goals and Objectives

Associated Planning Factors and Goals

Planning Factor Goal
B. Increase the safety of the transportation system for motorized and nonmotorized users; Achieve a significant reduction in traffic fatalities and serious injuries on all public roads
D. Increase the accessibility and mobility of people and for freight; Achieve a significant reduction in congestion
G. Promote efficient system management and operation; Improve the efficiency of the surface transportation system

Associated Objective Categories

Objective Category
Arterial Management: Traffic Monitoring and Data Collection
Arterial Management: Traffic Signal Management
Freeway Management: Transportation Management Centers
Safety: Vehicle Crashes and Fatalities
Transit Operations and Management: Demand Responsive Transit
Transit Operations and Management: Transit Signal Priority
Travel Weather Management: Signal Timing Plans

Associated Objectives and Performance Measures

Objective Performance Measure
Decrease delay by X percent per year by increasing the use of queue jumping and automated vehicle location. Travel time delay on routes with queue jumping and automated vehicle location in use.
Decrease system-wide signal delay on transit routes by X percent per year. System-wide signalized stop delay on transit routes.
Field data collection is conducted either through floating car studies or other methods at least once every Y years on major signalized arterials and X years on minor signalized arterials. Number of field data collection studies performed every Y and X years on major and minor signalized arterials, respectively.
Improve on-time pick-up of demand response transit passengers. Demand response passenger pick-up on-time performance
Improve the operational efficiency of the demand response transit service in the region. Operating expense per passenger mile
Improve the operational efficiency of the demand response transit service in the region. Operating expense per passenger trip
Improve the operational efficiency of the demand response transit service in the region. Passenger miles per vehicle
Improve the operational efficiency of the demand response transit service in the region. Passenger trips per vehicle
Increase implementation of transit signal priority strategies on X number of routes (or X number of intersections) over the next Y years. Number of transit routes/intersections equipped with transit signal priority capability.
Increase the hours of TMC operation and level of staffing by X percent by year Y. Number of hours of TMC operation and number of staff serving the TMC.
Increase the number of intersections running in a coordinated, closed-loop, or adaptive system by X percent in Y years. Number of intersections running in a coordinated, closed-loop, or adaptive system.
Increase the percent of regional transportation system monitored by the TMC for real-time performance. Percent of regional transportation system monitored by the TMC for real-time performance.
Reduce crashes at intersections Number of crashes and fatalities at signalized intersections
Reduce crashes at intersections Number of crashes and fatalities at unsignalized intersections
Reduce crashes at intersections Number of crashes and fatalities related to red-light running
Reduce crashes at railroad crossings Number of crashes and fatalities at railroad crossings
Reduce crashes due to red-light running Number of crashes and fatalities related to red-light running
Reduce crashes due to road weather conditions Number of crashes and fatalities related to weather conditions
Reduce crashes due to unexpected congestion Number of crashes and fatalities related to unexpected congestion
Reduce lane departure crashes Number of crashes and fatalities related to inappropriate lane departure, crossing or merging
Reduce secondary crashes Number of secondary crashes
Reduce the number of pedestrian fatalities by X percent by year Y. Number of pedestrian fatalities
Reduce the rate fatalities in the region by X percent by year Y. Rate of fatalities (rate per vehicle miles travelled (VMT))
Reduce the rate of severe injuries in the region by X percent by year Y. Rate of serious injuries (rate per VMT)
Reduce the total number of crashes in the region by X percent by year Y. Total crashes per X VMT.
Reduce the total number of crashes involving bicyclists and pedestrians in the region by X percent by year Y. Total crashes involving bicycles.
Reduce the total number of crashes involving bicyclists and pedestrians in the region by X percent by year Y. Total crashes involving pedestrians.
Reduce the total number of fatalities and severe injuries in the region by X percent by year Y. Total fatalities per X VMT.
Reduce the total number of fatalities and severe injuries in the region by X percent by year Y. Total severe injuries per X VMT.
Reduce the total number of fatalities in the region by X percent by year Y. Number of fatalities
Reduce the total number of severe injuries in the region by X percent by year Y. Number of serious injuries
Special timing plans are available for use during freeway incidents, roadway construction activities, or other special events for X miles of arterials in the region by year Y. Number of miles of arterials that have at least one special timing plan for incidents, construction, or events.
Special timing plans are available for use during inclement weather conditions for X miles of arterials in the region by year Y. Number of miles of arterials that have at least one special timing plan for inclement weather events.
X percent of intersections in the region are equipped and operating with traffic signals that enable real-time monitoring and management of traffic flows by year Y. Percent of intersections in the region equipped and operating with traffic signals that enable real-time monitoring and management of traffic flows.
X percent of major and minor arterials are equipped and operating with arterial link traffic data detection stations (appropriate technology) per Z distance by year Y. Percent of major and minor arterials equipped and operating with arterial link traffic data detection stations (appropriate technology) per Z distance.
X percent of major and minor arterials are equipped and operating with closed circuit television (CCTV) cameras per Z distance by year Y. Percent of major and minor arterials equipped and operating with closed circuit television (CCTV) cameras per Z distance.


 
Since the mapping between objectives and service packages is not always straight-forward and often situation-dependent, these mappings should only be used as a starting point. Users should do their own analysis to identify the best service packages for their region.

Needs and Requirements

Need Functional Object Requirement
01 System operators, vehicle operators, support system operators, PID users, maintenance personnel need their devices to operate on a common time base. Coordination of time between the internal systems that comprise the connected vehicle environment prevents internal synchronization errors and enables time sensitive interactions between all users. Center Support Services 01 The Center shall acquire time sync data from an external Stratum-2 time source.
02 The Center shall use the externally acquired time sync data to maintain its internal clocks.
DDS Support Services 04 The data support center shall obtain time sync data from the other Center.
05 The data support centershall acquire time sync data from an external Stratum-2 time source.
08 The data support center shall use the externally acquired time sync data to maintain its internal clocks.
Personal Location Determination 02 The Personal device shall obtain time and position data from its local location and time data source.
03 The Personal device shall make time and position data to device applications.
Roadway Time Management 01 The roadway field element shall acquire time sync data from an external Stratum-2 time source.
02 The roadway field element shall obtain time sync data from the System Monitor.
03 The roadway field element shall obtain time and position data from its local location and time data source.
RSE Support Services 01 The field element shall obtain time and position data from its local location and time data source.
03 The field element shall obtain time sync data from the Service Monitor.
04 The field element shall acquire time sync data from an external Stratum-2 time source.
SM Time Synchronization 01 The service monitor system shall use the externally acquired time sync data to maintain its internal clocks.
02 The service monitor system shall provide time sync data to other Centers.
03 The service monitor system shall provide time sync data to Connected Vehicle Roadway Equipment.
04 The service monitor system shall provide time sync data to ITS Roadway Equipment.
05 The service monitor system shall acquire time sync data from an external Stratum-2 time source.
Vehicle Location Determination 05 The vehicle shall provide its location with lane-level accuracy to other on-board applications.
06 The vehicle shall provide its location with road-level accuracy to other on-board applications.
02 Vehicle Operators, PID users and system operators need their devices to operate from a common geographic reference. Personal Location Determination 02 The Personal device shall obtain time and position data from its local location and time data source.
03 The Personal device shall make time and position data to device applications.
04 The Personal device shall obtain position correction data from the Connected Vehicle Roadside Equipment.
05 The Personal device shall apply position correction data to its base positional data.
Roadway Time Management 03 The roadway field element shall obtain time and position data from its local location and time data source.
RSE Position Correction Support 01 The field element shall obtain position correction information from an external position correction source.
02 The field element shall provide position correction information to proximate Vehicles.
03 The field element shall provide position correction information to proximate Personal devices.
RSE Support Services 01 The field element shall obtain time and position data from its local location and time data source.
Vehicle Location Determination 01 The vehicle shall provide the vehicle's current location to other in-vehicle functions.
02 The vehicle shall calculate the location from one or more data sources including positioning systems such as GPS, sensors that track vehicle movement, and maps used to determine the likely vehicle route.
03 The vehicle shall obtain position correction data from the Connected Vehicle Roadside Equipment.
04 The vehicle shall apply position correction data to its base positional data.
03 Vehicle Operators and PID users need their vehicles and devices to determine their current location. Personal Location Determination 01 The Personal device shall determine the traveler's current location. It is intended for use by traveler personal navigation and guidance systems, as well as emergency notification systems.
Personnel Location Determination 01 The Personal device shall determine the traveler's current location. It is intended for use by traveler personal navigation and guidance systems, as well as emergency notification systems.
02 The Personal device shall obtain time and position data from its local location and time data source.
03 The Personal device shall make time and position data to device applications.
04 The Personal device shall obtain position correction data from the Connected Vehicle Roadside Equipment.
05 The Personal device shall apply position correction data to its base positional data.

Related Sources

Document Name Version Publication Date
Core System Concept of Operations (ConOps) Final revE 10/24/2011
Core System System Architecture Document (SAD) Final revC 10/14/2011
Vehicle Safety Communications Applications (VSC-A) Final Report Final 9/1/2011
Vehicle-to-Infrastructure (V2I) Safety Applications Concept of Operation Document Draft 8/10/2012


Security

In order to participate in this service package, each physical object should meet or exceed the following security levels.

Physical Object Security
Physical Object Confidentiality Integrity Availability Security Class
Basic Vehicle  
Center Low Low High Class 5
Connected Vehicle Roadside Equipment Low High High Class 5
Data Distribution System Not Applicable Low Moderate Class 1
ITS Roadway Equipment Low Low High Class 5
Location and Time Data Source Moderate High High Class 5
Network Time Source Not Applicable High Moderate Class 3
Personal Information Device Moderate Moderate High Class 5
Personnel Device Moderate Moderate High Class 5
Position Corrections Source Not Applicable High High Class 5
Service Monitor System Not Applicable High Moderate Class 3
Vehicle OBE Moderate Moderate High Class 5



In order to participate in this service package, each information flow triple should meet or exceed the following security levels.

Information Flow Security
Source Destination Information Flow Confidentiality Integrity Availability
Basis Basis Basis
Basic Vehicle Vehicle OBE host vehicle status Low Moderate High
Unlikely that this includes any information that could be used against the originator. This can be MODERATE or HIGH, depending on the application: This is used later on to determine whether a vehicle is likely going to violate a red light or infringe a work zone. This needs to be correct in order for the application to work correctly. Since this monitors the health and safety of the vehicle and that information is eventually reported to the driver, it should be available at all times as it directly affects vehicle and operator safety.
Connected Vehicle Roadside Equipment Personal Information Device location correction Not Applicable High High
This data is intentionally transmitted to everyone via a broadcast. It can also be determined via other visual indicators. An incorrect location corrections message, could lead to a false warning or lack of warning. A lack of warning can have obvious catastrophic consequences, while a false warning could lead to users ignoring warnings due to perceived inaccuracy. Given that this triple may apply to highly dynamic environments (such as work zones), its accuracy is paramount, and thus if sent, must have HIGH integrity. If locations corrections are not delivered, catastrophic consequences could result from incorrect locations data on the device that should have received the corrections. DISC: HIGH is a tall barrier for this flow.
Connected Vehicle Roadside Equipment Personnel Device location correction Not Applicable High High
This data is intentionally transmitted to everyone via a broadcast. It can also be determined via other visual indicators. An incorrect location corrections message, could lead to a false warning or lack of warning. A lack of warning can have obvious catastrophic consequences, while a false warning could lead to users ignoring warnings due to perceived inaccuracy. Given that this triple may apply to highly dynamic environments (such as work zones), its accuracy is paramount, and thus if sent, must have HIGH integrity. If locations corrections are not delivered, catastrophic consequences could result from incorrect locations data on the device that should have received the corrections. DISC: HIGH is a tall barrier for this flow.
Connected Vehicle Roadside Equipment Vehicle OBE location correction Not Applicable High High
This data is intentionally transmitted to everyone via a broadcast. It can also be determined via other visual indicators. An incorrect location corrections message, could lead to a false warning or lack of warning. A lack of warning can have obvious catastrophic consequences, while a false warning could lead to users ignoring warnings due to perceived inaccuracy. Given that this triple may apply to highly dynamic environments (such as work zones), its accuracy is paramount, and thus if sent, must have HIGH integrity. If locations corrections are not delivered, catastrophic consequences could result from incorrect locations data on the device that should have received the corrections. DISC: HIGH is a tall barrier for this flow.
Location and Time Data Source Center location and time Low High High
Time reference and location information for Center systems should be observable. There is no reason to obfuscate. Location and time data is the basis for safety and a host of other applications.While a center-system is probably not in the critical decision path for safety-related applications, it is likely to be in the critical path for applications that have a significant effect on system wide applications of other types. Considering the wide-ranging impact a corruption in time and or location could have on those applications, a compromise in this flow could have major negative impacts. If this information is not available, applications depending on this information will not function properly. Given the scope of center-based applications, this flow's availability is of paramount importance.
Location and Time Data Source Connected Vehicle Roadside Equipment location and time Low High High
Time reference and location information for Field devices should be observable. There is no reason to obfuscate. Location and time data is the basis for safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, applications depending on this information will not function properly.
Location and Time Data Source ITS Roadway Equipment location and time Low High High
Time reference and location information for Field devices should be observable. There is no reason to obfuscate. Location and time data is the basis for safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, applications depending on this information will not function properly.
Location and Time Data Source Personal Information Device location and time Moderate High High
While time reference should be universally available, time reference coupled with personal location is tracking data. This flow is internal to a PID, but should probably be encrypted to discourage hacking. Thus MODERATE. Location and time data is the basis for safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, applications depending on this information will not function properly.
Location and Time Data Source Personnel Device location and time Moderate High High
While time reference should be universally available, time reference coupled with personal location is tracking data. This flow is internal to a PID, but should probably be encrypted to discourage hacking. Thus MODERATE. Location and time data is the basis for safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, applications depending on this information will not function properly.
Location and Time Data Source Vehicle OBE location and time Moderate High High
While time reference should be universally available, time reference coupled with vehicle location is tracking data. This flow is internal to a vehicle, but should probably be encrypted to discourage hacking and snooping on the vehicle bus. Thus MODERATE. Location and time data is the basis for crash imminent safety and a host of other applications. Corruption of this flow could lead directly to a vehicle accident. If this information is not available, crash imminent safety applications depending on this information will not function properly.
Network Time Source Center time Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Network Time Source Connected Vehicle Roadside Equipment time Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Network Time Source Data Distribution System time Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Network Time Source ITS Roadway Equipment time Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Network Time Source Service Monitor System time Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Position Corrections Source Connected Vehicle Roadside Equipment position corrections Not Applicable High High
This data is intentionally transmitted to everyone via a broadcast. It can also be determined via other visual indicators. An incorrect location corrections message, could lead to a false warning or lack of warning. A lack of warning can have obvious catastrophic consequences, while a false warning could lead to users ignoring warnings due to perceived inaccuracy. Given that this triple may apply to highly dynamic environments (such as work zones), its accuracy is paramount, and thus if sent, must have HIGH integrity. If locations corrections are not delivered, catastrophic consequences could result from incorrect locations data on the device that should have received the corrections. DISC: HIGH is a tall barrier for this flow.
Service Monitor System Center time local form Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Service Monitor System Connected Vehicle Roadside Equipment time local form Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Service Monitor System Data Distribution System time local form Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Service Monitor System ITS Roadway Equipment time local form Not Applicable High Moderate
Time reference is intended to be univerally available. Time must be highly coordinated for some applications. This support function must meet the highest requirement. Time coordination must always be in place, but local mechanisms for tracking time should suffice to avoid catastrophic failures for known use cases, thus MODERATE.
Service Monitor System Service Monitor System Operator service monitor information presentation Not Applicable High High
System core flows should have some protection from casual viewing, as otherwise imposters could gain illicit control over core equipment Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system.
Service Monitor System Operator Service Monitor System service monitor operator input Not Applicable High High
System core flows should have some protection from casual viewing, as otherwise imposters could gain illicit control over core equipment Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system. Backoffice operations flows should generally be correct and available as these are the primary interface between operators and system.

Standards

The following table lists the standards associated with physical objects in this service package. For standards related to interfaces, see the specific information flow triple pages.

Name Title Physical Object
ITE ATC ITS Cabinet Intelligent Transportation System Standard Specification for Roadside Cabinets ITS Roadway Equipment
NEMA TS 8 Cyber and Physical Security Cyber and Physical Security for Intelligent Transportation Systems ITS Roadway Equipment
Service Monitor System
USDOT RSU Dedicated Short-Range Communications Roadside Unit Specifications (FHWA-JPO-17-589) Connected Vehicle Roadside Equipment