< < TM20.1 : TM21.1 : TM21.2 > >
TM21.1: Wide Area Wireless Implementation
Speed recommendations are provided by wide area wireless communications. Infrastructure-based recommendations (e.g., via DMS) are also provided to support unequipped vehicles.
Relevant Regions: Australia, Canada, European Union, and United States
- Enterprise
- Functional
- Physical
- Goals and Objectives
- Needs and Requirements
- Sources
- Security
- Standards
- System Requirements
Enterprise
Development Stage Roles and Relationships
Installation Stage Roles and Relationships
Operations and Maintenance Stage Roles and Relationships
(hide)
| Source | Destination | Role/Relationship |
|---|---|---|
| Driver | Vehicle | Operates |
| ITS Roadway Equipment Maintainer | ITS Roadway Equipment | Maintains |
| ITS Roadway Equipment Manager | ITS Roadway Equipment | Manages |
| ITS Roadway Equipment Manager | Maint and Constr Field Personnel | System Usage Agreement |
| ITS Roadway Equipment Owner | ITS Roadway Equipment Maintainer | System Maintenance Agreement |
| ITS Roadway Equipment Owner | ITS Roadway Equipment Manager | Operations Agreement |
| ITS Roadway Equipment Owner | Traffic Management Center Maintainer | Maintenance Data Exchange Agreement |
| ITS Roadway Equipment Owner | Traffic Management Center Owner | Information Exchange Agreement |
| ITS Roadway Equipment Owner | Traffic Management Center User | Service Usage Agreement |
| ITS Roadway Equipment Owner | Traffic Operations Personnel | Application Usage Agreement |
| ITS Roadway Equipment Supplier | ITS Roadway Equipment Owner | Warranty |
| Maint and Constr Field Personnel | ITS Roadway Equipment | Operates |
| TIC Operator | Transportation Information Center | Operates |
| Traffic Management Center Maintainer | Traffic Management Center | Maintains |
| Traffic Management Center Manager | Traffic Management Center | Manages |
| Traffic Management Center Manager | Traffic Operations Personnel | System Usage Agreement |
| Traffic Management Center Owner | ITS Roadway Equipment Maintainer | Maintenance Data Exchange Agreement |
| Traffic Management Center Owner | ITS Roadway Equipment Owner | Information Exchange Agreement |
| Traffic Management Center Owner | ITS Roadway Equipment User | Service Usage Agreement |
| Traffic Management Center Owner | Maint and Constr Field Personnel | Application Usage Agreement |
| Traffic Management Center Owner | TIC Operator | Application Usage Agreement |
| Traffic Management Center Owner | Traffic Management Center Maintainer | System Maintenance Agreement |
| Traffic Management Center Owner | Traffic Management Center Manager | Operations Agreement |
| Traffic Management Center Owner | Transportation Information Center Maintainer | Maintenance Data Exchange Agreement |
| Traffic Management Center Owner | Transportation Information Center Owner | Information Exchange Agreement |
| Traffic Management Center Owner | Transportation Information Center User | Service Usage Agreement |
| Traffic Management Center Supplier | Traffic Management Center Owner | Warranty |
| Traffic Operations Personnel | Traffic Management Center | Operates |
| Transportation Information Center Maintainer | Transportation Information Center | Maintains |
| Transportation Information Center Manager | TIC Operator | System Usage Agreement |
| Transportation Information Center Manager | Transportation Information Center | Manages |
| Transportation Information Center Owner | Driver | Application Usage Agreement |
| Transportation Information Center Owner | Traffic Management Center Maintainer | Maintenance Data Exchange Agreement |
| Transportation Information Center Owner | Traffic Management Center Owner | Information Exchange Agreement |
| Transportation Information Center Owner | Traffic Management Center User | Service Usage Agreement |
| Transportation Information Center Owner | Traffic Operations Personnel | Application Usage Agreement |
| Transportation Information Center Owner | Transportation Information Center Maintainer | System Maintenance Agreement |
| Transportation Information Center Owner | Transportation Information Center Manager | Operations Agreement |
| Transportation Information Center Owner | Vehicle Maintainer | Maintenance Data Exchange Agreement |
| Transportation Information Center Owner | Vehicle Owner | Information Exchange Agreement |
| Transportation Information Center Owner | Vehicle User | Service Usage Agreement |
| Transportation Information Center Supplier | Transportation Information Center Owner | Warranty |
| Vehicle Maintainer | Vehicle | Maintains |
| Vehicle Manager | Driver | System Usage Agreement |
| Vehicle Manager | Vehicle | Manages |
| Vehicle Owner | TIC Operator | Application Usage Agreement |
| Vehicle Owner | Transportation Information Center Maintainer | Maintenance Data Exchange Agreement |
| Vehicle Owner | Transportation Information Center Owner | Information Exchange Agreement |
| Vehicle Owner | Transportation Information Center User | Service Usage Agreement |
| Vehicle Owner | Vehicle Maintainer | System Maintenance Agreement |
| Vehicle Owner | Vehicle Manager | Operations Agreement |
| Vehicle Supplier | Vehicle Owner | Warranty |
Functional
This service package includes the following Functional View PSpecs:
Physical
The physical diagram can be viewed in SVG or PNG format and the current format is SVG.SVG Diagram
PNG Diagram
Includes Physical Objects:
| Physical Object | Class | Description |
|---|---|---|
| Driver | Vehicle | The 'Driver' represents the person that operates a vehicle on the roadway. Included are operators of private, transit, commercial, and emergency vehicles where the interactions are not particular to the type of vehicle (e.g., interactions supporting vehicle safety applications). The Driver originates driver requests and receives driver information that reflects the interactions which might be useful to all drivers, regardless of vehicle classification. Information and interactions which are unique to drivers of a specific vehicle type (e.g., fleet interactions with transit, commercial, or emergency vehicle drivers) are covered by separate objects. |
| 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. |
| Traffic Management Center | Center | The 'Traffic Management Center' monitors and controls traffic and the road network. It represents centers that manage a broad range of transportation facilities including freeway systems, rural and suburban highway systems, and urban and suburban traffic control systems. It communicates with ITS Roadway Equipment and Connected Vehicle Roadside Equipment (RSE) to monitor and manage traffic flow and monitor the condition of the roadway, surrounding environmental conditions, and field equipment status. It manages traffic and transportation resources to support allied agencies in responding to, and recovering from, incidents ranging from minor traffic incidents through major disasters. |
| Traffic Operations Personnel | Center | 'Traffic Operations Personnel' represents the people that operate a traffic management center. These personnel interact with traffic control systems, traffic surveillance systems, incident management systems, work zone management systems, and travel demand management systems. They provide operator data and command inputs to direct system operations to varying degrees depending on the type of system and the deployment scenario. |
| Transportation Information Center | Center | The 'Transportation Information Center' collects, processes, stores, and disseminates transportation information to system operators and the traveling public. The physical object can play several different roles in an integrated ITS. In one role, the TIC provides a data collection, fusing, and repackaging function, collecting information from transportation system operators and redistributing this information to other system operators in the region and other TICs. In this information redistribution role, the TIC provides a bridge between the various transportation systems that produce the information and the other TICs and their subscribers that use the information. The second role of a TIC is focused on delivery of traveler information to subscribers and the public at large. Information provided includes basic advisories, traffic and road conditions, transit schedule information, yellow pages information, ride matching information, and parking information. The TIC is commonly implemented as a website or a web-based application service, but it represents any traveler information distribution service. |
| Vehicle | Vehicle | 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 (including motorcycles), 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. |
| Vehicle Characteristics | Vehicle | 'Vehicle Characteristics' represents the external view of individual vehicles of any class from cars and light trucks up to large commercial vehicles and down to micromobility vehicles (MMVs). It includes vehicle physical characteristics such as height, width, length, weight, and other properties (e.g., magnetic properties, number of axles, occupants, emissions) of individual vehicles that can be sensed and measured or classified. This physical object represents the physical properties of vehicles that can be sensed by vehicle-based or infrastructure-based sensors to support vehicle automation and traffic sensor systems. The analog properties provided by this terminator represent the sensor inputs that are used to detect and assess vehicle(s) within the sensor's range to support safe AV operation and/or responsive and safe traffic management. |
Includes Functional Objects:
| Functional Object | Description | Physical Object |
|---|---|---|
| Roadway Surveillance | 'Roadway Basic Surveillance' monitors traffic conditions using fixed equipment such as loop detectors, CCTV cameras, , RADARs and LIDARs. | ITS Roadway Equipment |
| Roadway Traffic Information Dissemination | 'Roadway Traffic Information Dissemination' includes field elements that provide information to drivers, including dynamic message signs and highway advisory radios. | ITS Roadway Equipment |
| Roadway Variable Speed Limits | 'Roadway Variable Speed Limits' includes the field equipment, physical overhead lane signs and associated control electronics that are used to manage and control variable speed limits systems. This equipment monitors traffic and environmental conditions along the roadway. The system can be centrally monitored and controlled by a Traffic Management Center or it can be autonomous, calculating and setting suitable speed limits, usually by lane. This application displays the speed limits and additional information such as basic safety rules and current traffic information to drivers. | ITS Roadway Equipment |
| TIC Situation Data Management | 'TIC Situation Data Management' manages connected vehicle situation data collection, quality controls, filtering, aggregation, and storage. Through this process, raw data reported by connected vehicles are transformed into information products that can be accessed and used to support transportation operations and traveler information. | Transportation Information Center |
| TIC Traffic Control Dissemination | 'TIC Traffic Control Dissemination' serves as intermediary between transportation operations centers (e.g., TMC, Transit MC) and transportation users (e.g., vehicles, personal devices). It collects and disseminates intersection status, lane control information, special vehicle alerts, and other traffic control related information that is real-time or near real-time in nature and relevant to vehicles in a relatively local area on the road network. It collects traffic control information from Traffic Management and other Center(s) and disseminates the relevant information to vehicles and other mobile devices. | Transportation Information Center |
| TMC Basic Surveillance | 'TMC Basic Surveillance' remotely monitors and controls traffic sensor systems and surveillance (e.g., CCTV) equipment, and collects, processes and stores the collected traffic data. Current traffic information and other real-time transportation information is also collected from other centers. The collected information is provided to traffic operations personnel and made available to other centers. | Traffic Management Center |
| TMC Environmental Monitoring | 'TMC Environmental Monitoring' assimilates current and forecast road conditions and surface weather information using a combination of weather service provider information, information collected by other centers such as the Maintenance and Construction Management Center, data collected from environmental sensors deployed on and about the roadway, and information collected from connected vehicles. The collected environmental information is monitored and presented to the operator. This information can be used to issue general traveler advisories and support location specific warnings to drivers. | Traffic Management Center |
| TMC Traffic Information Dissemination | 'TMC Traffic Information Dissemination' disseminates traffic and road conditions, closure and detour information, incident information, driver advisories, and other traffic-related data to other centers, the media, and driver information systems. It monitors and controls driver information system field equipment including dynamic message signs and highway advisory radio, managing dissemination of driver information through these systems. | Traffic Management Center |
| TMC Variable Speed Limits | 'TMC Variable Speed Limits' provides center monitoring and control of variable speed limits systems. It monitors data on traffic and environmental conditions collected from sensors along the roadway. Based on the measured data, it calculates and sets suitable speed limits usually by lane. It controls equipment that posts the current speed limits and displays additional information such as basic safety rules and current traffic information to drivers. | Traffic Management Center |
| Vehicle Basic Safety Communication | 'Vehicle Basic Safety Communication' exchanges current vehicle characteristics, location, and motion (including past and intended maneuver) information with other vehicles in the vicinity and the infrastructure, uses that information to calculate vehicle paths, and warns the driver when the potential for an impending collision is detected. If available, map data is used to filter and interpret the relative location and motion of vehicles in the vicinity. Information from on-board sensors (e.g., radars and image processing) are also used, if available, in combination with the V2V communications to detect non-equipped vehicles and corroborate connected vehicle data. This object represents a broad range of implementations ranging from basic Vehicle Awareness Devices that only broadcast vehicle location and motion and provide no driver warnings to advanced integrated safety systems that coordinate maneuvers and may, in addition to warning the driver, provide collision warning information to support automated control functions that can support control intervention. This object can also support broadcasting other vehicle information required for passing through a specific roadway segment such as variables that describe vehicle's characteristics and parameters, driver's preferences in terms of vehicle motion and behavior, etc. | Vehicle |
| Vehicle Environmental Monitoring | 'Vehicle Environmental Monitoring' collects data from on-board sensors and systems related to environmental conditions and sends the collected data to the infrastructure as the vehicle travels. The collected data is a byproduct of vehicle safety and convenience systems and includes ambient air temperature and precipitation measures and status of the wipers, lights, ABS, and traction control systems. | Vehicle |
| Vehicle Situation Data Monitoring | 'Vehicle Situation Data Monitoring' is the highest-level representation of the functionality required to collect traffic and environmental situation data by monitoring and storing the experience of the vehicle as it travels through the road network. Collected data is aggregated into snapshots that are reported when communications is available and with flow control based on parameters provided by the infrastructure. Note that this functional object supports collection of data for areas remote from RSEs or other communications infrastructure. | Vehicle |
| Vehicle Speed Management Assist | 'Vehicle Speed Management Assist' assists the driver in operating the vehicle within the current speed limit. It monitors current vehicle speed and communicates with the infrastructure to receive current speed limits and associated road configuration change notifications. Driver warnings are issued when unsafe or excessive speeds are detected based on the provided speed limits and current conditions. | Vehicle |
| Vehicle Traveler Information Reception | 'Vehicle Traveler Information Reception' receives advisories, vehicle signage data, and other driver information of use to all types of vehicles and drivers and presents this information to the driver using in-vehicle equipment. Information presented may include fixed sign information, traffic control device status (e.g., signal phase and timing data), advisory and detour information, warnings of adverse road and weather conditions, travel times, and other driver information. | Vehicle |
Includes Information Flows:
| Information Flow | Description |
|---|---|
| driver information | Regulatory, warning, guidance, and other information provided to the driver to support safe and efficient vehicle operation. |
| driver input | Driver input to the vehicle on-board equipment including configuration data, settings and preferences, interactive requests, and control commands. |
| driver updates | Information provided to the driver including visual displays, audible information and warnings, and haptic feedback. The updates inform the driver about current conditions, potential hazards, and the current status of vehicle on-board equipment. |
| road network traffic situation data | Aggregated route usage, travel times, and other aggregated measures based on data collected from probe vehicles. Raw and/or filtered vehicle control events may also be included to support incident detection. This flow represents aggregate data collected from many probe data collection points (e.g., CVRSEs or MECs) and/or from wide-area wireless communications with probe vehicles covering an area of interest or region. |
| roadway dynamic signage data | Information used to initialize, configure, and control dynamic message signs. This flow can provide message content and delivery attributes, local message store maintenance requests, control mode commands, status queries, and all other commands and associated parameters that support remote management of these devices. |
| roadway dynamic signage status | Current operating status of dynamic message signs. |
| speed management information | Target speeds, speed advisories, and/or speed limit information provided to a vehicle. The information includes the current speed value(s), the route segment(s) and lane(s) where the speeds apply, and an indication of whether the speeds are suggested target speeds, posted advisory speeds, or enforceable speed limit values. This flow may also include information about the reason for reduced speeds and provide target lane information if lane changes are required. |
| traffic detector control | Information used to configure and control traffic detector systems such as inductive loop detectors and machine vision sensors. |
| traffic detector data | Raw and/or processed traffic detector data which allows derivation of traffic flow variables (e.g., speed, volume, and density measures) and associated information (e.g., congestion, potential incidents). This flow includes the traffic data and the operational status of the traffic detectors |
| traffic operator data | Presentation of traffic operations data to the operator including traffic conditions, current operating status of field equipment, maintenance activity status, incident status, video images, security alerts, emergency response plan updates and other information. This data keeps the operator appraised of current road network status, provides feedback to the operator as traffic control actions are implemented, provides transportation security inputs, and supports review of historical data and preparation for future traffic operations activities. |
| traffic operator input | User input from traffic operations personnel including requests for information, configuration changes, commands to adjust current traffic control strategies (e.g., adjust signal timing plans, change DMS messages), and other traffic operations data entry. |
| variable speed limit control | Information used to configure and control variable speed limit systems including the equipment used to provide current speed limits and other information to drivers. |
| variable speed limit status | Current operating status of the variable speed limit systems including the state of the equipment. |
| vehicle characteristics | The physical or visible characteristics of individual vehicles that can be used to detect, classify, and monitor vehicles and imaged to uniquely identify vehicles and characterize their performance (e.g., speed, occupants, emissions). |
| vehicle environmental data | Data from vehicle safety and convenience systems that can be used to estimate environmental and infrastructure conditions, including measured air temperature, exterior light status, wiper status, sun sensor status, rain sensor status, traction control status, anti-lock brake status, vertical acceleration and other collected vehicle system status and sensor information. The collected data is reported along with the location, heading, and time that the data was collected. Both current data and snapshots of recent events (e.g., traction control or anti-lock brake system activations) may be reported. |
| vehicle situation data | This flow represents vehicle snapshots that may be provided by the vehicle to support traffic and environmental conditions monitoring. Snapshots are collected by the vehicle for specific events (e.g., when a sensor exceeds a threshold) or periodically and reported based on control parameters when communications is available. Traffic-related data includes snapshots of measured speed and heading and events including starts and stops, speed changes, and other vehicle control events. Environmental data may include measured air temperature, exterior light status, wiper status, sun sensor status, rain sensor status, traction control status, anti-lock brake status, and other collected vehicle system status and sensor information. The collected data is reported along with the location, heading, and time that the data was collected. |
| vehicle situation data parameters | A request for vehicle situation data that includes parameters used to control the data that is reported and the flow of data reported by the vehicle. This flow identifies the type of data/snapshots that are requested and reporting parameters such as snapshot frequency, filtering criteria (data thresholds for reporting), and reporting interval. |
Goals and Objectives
Associated Planning Factors and Goals
| Planning Factor | Goal |
|---|---|
| A. Support the economic vitality of the metropolitan area, especially by enabling global competitiveness, productivity, and efficiency; | Improve freight network |
| B. Increase the safety of the transportation system for motorized and nonmotorized users; | Reduce fatalities and injuries |
| D. Increase the accessibility and mobility of people and for freight; | Reduce congestion |
| E. Protect and enhance the environment, promote energy conservation, improve the quality of life, and promote consistency between transportation improvements and State and local planned growth and economic development patterns; | Protect/Enhance the Environment |
| G. Promote efficient system management and operation; | Improve efficiency |
| I. Improve the resiliency and reliability of the transportation system and reduce or mitigate stormwater impacts of surface transportation; | Improve resiliency and reliability |
Associated Objective Categories 
Associated Objectives and Performance Measures
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 | Traffic Operations need to be able to collect and process current and historical traffic and environmental data from multiple sources in order to determine speed recommendations based on traffic conditions and weather and environmental information. | Roadway Surveillance | 01 | The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control. |
| Roadway Variable Speed Limits | 01 | The field element shall monitor traffic and environmental conditions along the roadway. | ||
| 02 | The field element shall autonomously calculate and set variable speed limits based on current conditions by lane. | |||
| 03 | The field element shall receive commands from the controlling center that establish speed limits by lane. | |||
| 06 | The field element shall collect operational status of the variable speed limit field equipment and report the operational status to the controlling center. | |||
| 07 | The field element shall monitor and report faults to the controlling center. | |||
| TIC Situation Data Management | 01 | The center shall collect traffic probe data (speeds, travel times, etc.) from appropriately equipped vehicles and short range communications equipment. | ||
| 05 | The center shall aggregate collected traffic probe data, calculate route segment travel times, route segment speeds, route usage, and road weather information for dissemination to other centers. | |||
| TMC Basic Surveillance | 01 | The center shall monitor, analyze, and store traffic sensor data (speed, volume, occupancy) collected from field elements under remote control of the center. | ||
| 07 | The center shall remotely control devices to detect traffic. | |||
| TMC Traffic Information Dissemination | 05 | The center shall retrieve locally stored traffic information, including current and forecasted traffic information, road and weather conditions, traffic incident information, information on diversions and alternate routes, closures, and special traffic restrictions (lane/shoulder use, weight restrictions, width restrictions, HOV requirements), and the definition of the road network itself. | ||
| TMC Variable Speed Limits | 01 | The center shall monitor data on traffic and environmental conditions collected from sensors along the roadway. | ||
| 03 | The center shall control field equipment that posts the current speed limits and displays additional information such as basic safety rules and current traffic information to drivers. | |||
| 04 | The center shall monitor the operational status of the variable speed limit equipment, including fault reports. | |||
| Vehicle Basic Safety Communication | 06 | The vehicle shall exchange location and motion information with roadside equipment and nearby vehicles. | ||
| 18 | The vehicle shall provide measured and derived environmental conditions data to other vehicles and roadside equipment. | |||
| Vehicle Environmental Monitoring | 03 | The vehicle shall transmit environmental probe data to the center along with location and timestamp information. | ||
| Vehicle Situation Data Monitoring | 02 | The Vehicle shall collect data collection parameters from Centers. | ||
| 05 | The Vehicle shall provide data to Centers in accordance with data collection parameters provided by Centers/Connected Vehicle Roadside Equipment. | |||
| 02 | Traffic Operations need to be able to inform the Driver of the recommended speed to travel, allowing the driver to make adjustments to maximize traffic throughput and reduce crashes. | Roadway Traffic Information Dissemination | 01 | The field element shall include dynamic message signs for dissemination of traffic and other information to drivers, under center control; the DMS may be either those that display variable text messages, or those that have fixed format display(s) (e.g. vehicle restrictions, or lane open/close). |
| Roadway Variable Speed Limits | 04 | The field element shall display the current speed limits per lane to drivers. | ||
| 08 | The field element shall display suggested harmonized speed per lane to drivers. | |||
| 09 | The field element shall send suggested speed per lane to the RSE for transmittal to connected vehicles. | |||
| TIC Traffic Control Dissemination | 04 | The center shall provide target speed limit, speed advisories, and/or speed limit information to vehicle. | ||
| TMC Traffic Information Dissemination | 01 | The center shall remotely control dynamic messages signs for dissemination of traffic and other information to drivers. | ||
| TMC Variable Speed Limits | 02 | Based on the measured data, the center shall calculate and set suitable speed limits by lane. | ||
| Vehicle Speed Management Assist | 01 | Vehicle shall monitor current vehicle speed and communicates with the infrastructure to receive current speed limits or speed recommendations. | ||
| Vehicle Traveler Information Reception | 02 | The vehicle shall receive advisory information, such as evacuation information, proximity to a maintenance and construction vehicle, wide-area alerts, work zone intrusion information, variable speed limits, tunnel entrance restrictions, border crossing advisories, and other special information. | ||
| 03 | Traffic Operations need to be able to inform the Driver of why the given speed is being recommended to increase their willingness to comply with the recommendations. | Roadway Variable Speed Limits | 05 | The field element shall display additional information such as basic safety rules and current traffic information to drivers. |
| TMC Variable Speed Limits | 06 | The center shall provide the current speed limits and additional information such as basic safety rules and current traffic information to drivers. | ||
| 04 | Traffic Operations need to be able to analyze performance of transportation system in order to develop strategies to improve the performance of the system. | Roadway Surveillance | 01 | The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control. |
| 04 | The field element shall return sensor and CCTV system operational status to the controlling center. | |||
| TMC Environmental Monitoring | 01 | The traffic center shall remotely control environmental sensors that measure road surface conditions including temperature, moisture, icing, salinity, and other measures. | ||
| 02 | The traffic center shall remotely control environmental sensors that measure weather conditions including temperature, wind, humidity, precipitation, and visibility. | |||
| 05 | Traffic Operations need to be able to disseminate recommended speed information to other centers. | TMC Variable Speed Limits | 05 | The center shall provide center personnel current system status and respond to control data from center personnel regarding variable speed limits. |
Related Sources
| Document Name | Version | Publication Date |
|---|---|---|
| None |
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 |
| ITS Roadway Equipment | Moderate | Moderate | Moderate | Class 2 |
| Traffic Management Center | Moderate | High | Moderate | Class 3 |
| Transportation Information Center | Moderate | Moderate | Moderate | Class 2 |
| Vehicle | Moderate | Moderate | Moderate | Class 2 |
| Vehicle Characteristics | ||||
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 | |||
| Driver | Vehicle | driver input | Moderate | High | High |
| Data included in this flow may include origin and destination information, which should be protected from other's viewing as it may compromise the driver's privacy. | Commands from from the driver to the vehicle must be correct or the vehicle may behave in an unpredictable and possibly unsafe manner | Commands must always be able to be given or the driver has no control. | |||
| ITS Roadway Equipment | Driver | driver information | Not Applicable | High | Moderate |
| This data is sent to all drivers and is also directly observable, by design. | This is the primary signal trusted by the driver to decide whether to go through the intersection and what speed to go through the intersection at; if it’s wrong, accidents could happen. | If the lights are out you have to get a policeman to direct traffic – expensive and inefficient and may cause a cascading effect due to lack of coordination with other intersections. | |||
| ITS Roadway Equipment | Traffic Management Center | roadway dynamic signage status | Moderate | Moderate | Moderate |
| Device status information should not be available, as those with criminal intent may use this information toward their own ends. | Data is intended to feed dissemination channels, either C-ITS messages or DMS or other channels, so it should generally be correct as it is distributed widely and any forgery or corrupted data will have widespread impact. | Failure of this flow affects traveler information dissemination, the importance of which varies with the data contained in the flow and the scenario. Could be LOW in many instances. | |||
| ITS Roadway Equipment | Traffic Management Center | traffic detector data | Low | Moderate | Moderate |
| No impact if someone sees the data | Some minimal guarantee of data integrity is necessary for all C-ITS flows. THEA believes this to be LOW.only limited adverse effect if raw/processed traffic detector data is bad/compromised; DISC: WYO believes this to be HIGH | Only limited adverse effect of info is not timely/readily available, however without this information it will be difficult to perform traffic management activities, thus MODERATE. If not used for management, may be LOW. | |||
| ITS Roadway Equipment | Traffic Management Center | variable speed limit status | Low | Moderate | Moderate |
| This information is directly observable | The TMC will react based on current status of ITS-RE and thus this information should be trusted. DISC: WYO believes this to be HIGH. | The information should be available to ensure timely response from TMC | |||
| Traffic Management Center | ITS Roadway Equipment | roadway dynamic signage data | Moderate | Moderate | Moderate |
| Device control information should not be available, as those with criminal intent may use this information toward their own ends. | Data is intended to feed dissemination channels, either C-ITS messages or DMS or other channels, so it should generally be correct as it is distributed widely and any forgery or corrupted data will have widespread impact. | Occasional outages of this flow will delay dissemination of the data to travelers (the eventual end user) which could have significant impacts on travel, both safety and mobility impacts. | |||
| Traffic Management Center | ITS Roadway Equipment | traffic detector control | Moderate | Moderate | Low |
| Control flows, even for seemingly innocent devices, should be kept confidential to minimize attack vectors. While an individual installation may not be particularly impacted by a cyberattack of its sensor network, another installation might be severely impacted, and different installations are likely to use similar methods, so compromising one leads to compromising all. DISC: THEA, WYO believe this to be LOW: encrypted, authenticated, proprietary; but should not cause severe damage if seen | 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.. From THEA: should be accurate and not be tampered with; could enable outside control of traffic sensors but should not cause severe harm, but could cause issues with traffic sensor data received and be detrimental to operations | 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.. From THEA: want updates but delayed information will not be severe; should be able to operate from a previous/default control/config. DISC: WYO believes this to be MODERATE | |||
| Traffic Management Center | ITS Roadway Equipment | variable speed limit control | Moderate | High | Moderate |
| Control flows, even for seemingly innocent devices, should be kept confidential to minimize attack vectors. While an individual installation may not be particularly impacted by a cyberattack of its sensor network, another installation might be severely impacted, and different installations are likely to use similar methods, so compromising one leads to compromising all.. DISC: WYO believes this to be LOW or MODERATE depending on the application. NYC believes it to be LOW, as this information is directly observable. | 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. From NYC: The information sent from TMC directly affect the ITS-RE speed “announcement”. | NYC: The ITS-RE can work accordingly or in fail-safe if information is not available. WYO believes this to be MODERATE. Given the impacts for WYO scnearios, defaulted to MODERATE. | |||
| Traffic Management Center | Traffic Operations Personnel | traffic operator data | Moderate | Moderate | Moderate |
| Backoffice operations flows should have minimal protection from casual viewing, as otherwise imposters could gain illicit control or information that should not be generally available. | Information presented to backoffice system operators must be consistent or the operator may perform actions that are not appropriate to the real situation. | The backoffice system operator should have access to system operation. If this interface is down then control is effectively lost, as without feedback from the system the operator has no way of knowing what is the correct action to take. | |||
| Traffic Management Center | Transportation Information Center | speed management information | Low | Moderate | Moderate |
| This information is directly observable. | Wrong information would either falsely warn or advise the driver. DISC: WYO believes this to be HIGH. | These notifications are helpful to a driver, if the driver does not receive this notification immediately, there should still be other visual cues | |||
| Traffic Operations Personnel | Traffic Management Center | traffic operator input | Moderate | High | High |
| Backoffice operations flows should have minimal protection from casual viewing, as otherwise imposters could gain illicit control or information that should not be generally available. | 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. | |||
| Transportation Information Center | Traffic Management Center | road network traffic situation data | Moderate | Moderate | Moderate |
| The data this is based on is not encrypted, but aggregated messages may have more privacy implications than individual ones. | Should be limited effect if this data is incorrect or compromised, as there should be other mechanisms in place to validate it. | This information is used as supplemental information. It should operate correctly if not every single message is received. | |||
| Transportation Information Center | Vehicle | speed management information | Low | Moderate | Moderate |
| This information is directly observable. | Wrong information would either falsely warn or advise the driver. DISC: WYO believes this to be HIGH. | These notifications are helpful to a driver, if the driver does not receive this notification immediately, there should still be other visual cues | |||
| Transportation Information Center | Vehicle | vehicle situation data parameters | Low | Moderate | Moderate |
| This isn't exactly a control flow, more like a 'suggestion flow', as the vehicle will always decide what to send. Probably no need for obfuscation. | Info should be accurate and should not be tampered so that the vehicle only discloses the correctly requested data | Parameters should be timely and readily available, but would not have severe/catastrophic consequences if not | |||
| Vehicle | Driver | driver updates | Not Applicable | Moderate | Moderate |
| This data is informing the driver about the safety of a nearby area. It should not contain anything sensitive, and does not matter if another person can observe it. | This is the information that is presented to the driver. If they receive incorrect information, they may act in an unsafe manner. However, there are other indicators that would alert them to any hazards, such as an oncoming vehicle or crossing safety lights. | If this information is not made available to the driver, then the system has not operated correctly. | |||
| Vehicle | Transportation Information Center | vehicle environmental data | Low | Moderate | Moderate |
| Little abusive potential for capturing the information in this flow as designed. Could be moderate if this contains PII related information, but considered for now to not include any PII; DISC: WYO believes Vehicle to Center versions of this flow to be MODERATE as center penetrations could more easily garner aggregate user data that might be used for mischief. | This could be used for safety applications, and in areas of severe weather a corrupted field could have significant consequences; however, any vehicle will use other inputs before triggering automatic safety facilities, so MODERATE should be sufficient. DISC: WYO believes this to be HIGH. | This data is required for the system to operate properly. If this data is not available, the system cannot give accurate warning information. | |||
| Vehicle | Transportation Information Center | vehicle situation data | Moderate | Moderate | Low |
| Might be able to link multiple snapshots together and compromise some element of driver/traveler privacy. | Event driven data can be used for various mobility monitoring applications, and as operational decisions may be made based on mobility conditions, this data's accuracy should be preserved or decisions may not align with real situations. | While desireable, in most application contexts the provision of a single vehicle's data through this flow is not critical. | |||
| Vehicle Characteristics | ITS Roadway Equipment | vehicle characteristics | |||
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. These pages can be accessed directly from the SVG diagram(s) located on the Physical tab, by clicking on each information flow line on the diagram.
| Name | Title | Known Issues | Physical Object |
|---|---|---|---|
| ISO 15623 Fwd Collision Performance | Intelligent transport systems -- Forward vehicle collision warning systems -- Performance requirements and test procedures | Vehicle | |
| ISO 24100 Probe Vehicle Data Protection | Intelligent transport systems -- Basic principles for personal data protection in probe vehicle information services | Traffic Management Center | |
| Transportation Information Center | |||
| ITE 5201 ATC | Advanced Transportation Controller | ITS Roadway Equipment | |
| ITE 5202 ATC Model 2070 | Model 2070 Controller Standard | Out of date (high): Standard has been rescinded and is not recommended for use by the original issuing SDO. | ITS Roadway Equipment |
| ITE 5301 ATC ITS Cabinet | Intelligent Transportation System Standard Specification for Roadside Cabinets | ITS Roadway Equipment | |
| ITE 5401 ATC API | Application Programming Interface Standard for the Advanced Transportation Controller | ITS Roadway Equipment | |
| NEMA TS 8 Cyber and Physical Security | Cyber and Physical Security for Intelligent Transportation Systems | ITS Roadway Equipment | |
| Traffic Management Center | |||
| NEMA TS2 Traffic Controller Assemblies | Traffic Controller Assemblies with NTCIP Requirements | ITS Roadway Equipment | |
| NEMA TS4 Hardware Standards for DMS | Hardware Standards for Dynamic Message Signs (DMS) With NTCIP Requirements | ITS Roadway Equipment | |
| SAE J3361 Antenna requirements | V2X Antenna Coverage and Test Requirements for US FHWA Class 1 and Class 3-13 Class Vehicles | Draft not available (Critical): under development | Vehicle |
| SAE J5001 OBU Standard | Onboard Unit Standard for Connected Vehicles | Draft not available (Critical): under development | Vehicle |
System Requirements
| No System Requirements |