Architecture Flow Descriptions
Architecture Flow
Description
alarm
Information about a Commercial Vehicle or Freight Equipment breach, non-
permitted security sensitive hazmat detected at the roadside, route deviation,
or Commercial Vehicle Driver / Commercial Vehicle / Freight Equipment
assignment mismatches which includes the location of the Commercial
Vehicle and appropriate identities.
alarm acknowledge
alarm notification
alert notification
Confirmation that alarm was received, instructions and additional information
for the alarm initiator, and requests for additional information.
Notification of activation of an audible or silent alarm by a traveler in a public
area or by a transit vehicle operator using an on-board device.
Notification of a major emergency such as a natural or man-made disaster,
civil emergency, or child abduction for distribution to the public. The flow
identifies the alert originator, the nature of the emergency, the geographic area
affected by the emergency, the effective time period, and information and
instructions necessary for the public to respond to the alert. This flow may
also identify specific information that should not be released to the public.
alert notification coordination
Coordination of emergency alerts to be distributed to the public. This includes
notification of a major emergency such as a natural or man-made disaster, civil
emergency, or child abduction for distribution to the public and status of the
public notification.
alert status
Information indicating the current status of the emergency alert including
identification of the traveler and driver information systems that are being used
to provide the alert.
alerts and advisories
Assessments (general incident and vulnerability awareness information),
advisories (identification of threats or recommendations to increase
preparedness levels), and alerts (information on imminent or in-progress
emergencies). This flow also provides supporting descriptive detail on
incidents, threats, and vulnerabilities to increase preparedness and support
effective response to threats against the surface transportation system.
alerts and advisories_ud
Assessments (general incident and vulnerability awareness information),
advisories (identification of threats or recommendations to increase
preparedness levels), and alerts (information on imminent or in-progress
emergencies). This flow also provides supporting descriptive detail on
incidents, threats, and vulnerabilities to increase preparedness and support
effective response to threats against the surface transportation system.
amber alert confirmation_ud
amber alert_ud
The confirmation that the amber alert message was received, and the current
status of the amber alert.
Amber alert information. Can be placed on dynamic message signs controlled
by a traffic management element.
archive coordination
Catalog data, meta data, published data, and other information exchanged
between archives to support data synchronization and satisfy user data
requests.
archive requests
A request to a data source for information on available data (i.e. "catalog") or a
request that defines the data to be archived. The request can be a general
subscription intended to initiate a continuous or regular data stream or a
specific request intended to initiate a one-time response from the recipient.
archive status
Notification that data provided to an archive contains erroneous, missing, or
suspicious data or verification that the data provided appears valid. If an error
has been detected, the offending data and the nature of the potential problem
are identified.
border incident response status
Status of the current incident response at a border crossing, including a
summary of incident status and its impact on the transportation system, traffic
management strategies implemented at the site (e.g., closures, diversions,
traffic signal control overrides), and current and planned response activities.
border information archive data
broadcast traveler information
Border inspection activities data. Content may include a catalog of available
information, the actual information to be archived, and associated meta data
that describes the archived information.
General traveler information that contains traffic and road conditions, link travel
times, incidents, advisories, transit service information, weather information,
parking information, and other related traveler information.
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Architecture Flow
Description
emergency plan coordination
Information that supports coordination of emergency management plans,
continuity of operations plans, emergency response and recovery plans,
evacuation plans, and other emergency plans between agencies. This
includes general plans that are coordinated prior to an incident and shorter
duration tactical plans that are prepared during an incident.
emergency traffic control information
emergency traffic control request
Status of a special traffic control strategy or system activation implemented in
response to an emergency traffic control request, a request for emergency
access routes, a request for evacuation, a request to activate closure systems,
a request to employ driver information systems to support public safety
objectives, or other special requests. Identifies the selected traffic control
strategy and system control status.
Special request to preempt the current traffic control strategy in effect at one or
more signalized intersections or highway segments, activate traffic control and
closure systems such as gates and barriers, activate safeguard systems, or
use driver information systems. For example, this flow can request all signals
to red-flash, request a progression of traffic control preemptions along an
emergency vehicle route, request a specific evacuation traffic control plan,
request activation of a road closure barrier system, or place a public safety or
emergency-related message on a dynamic message sign.
emergency transit schedule information
emergency transit service request
Information on transit schedule and service changes that adapt the service to
better meet needs of responders and the general public in an emergency
situation, including special service schedules supporting evacuation.
Request to modify transit service and fare schedules to address emergencies,
including requests for transit services to evacuate people from and/or deploy
response agency personnel to an emergency scene. The request may poll for
resource availability or request pre-staging, staging, or immediate dispatch of
transit resources.
emergency transit service response
emergency traveler information
Response indicating changes to transit service, fares, and/or restrictions that
will be made and status of transit resources to be deployed to support
emergency response and/or evacuation.
Public notification of an emergency such as a natural or man-made disaster,
civil emergency, or child abduction. This flow also includes evacuation
information including evacuation instructions, evacuation zones,
recommended evacuation times, tailored evacuation routes and destinations,
traffic and road conditions along the evacuation routes, traveler services and
shelter information, and reentry times and instructions.
emergency traveler information request
Request for alerts, evacuation information, and other emergency information
provided to the traveling public.
emergency vehicle tracking data
environmental conditions data
The current location and operating status of the emergency vehicle.
Current road conditions (e.g., surface temperature, subsurface temperature,
moisture, icing, treatment status) and surface weather conditions (e.g., air
temperature, wind speed, precipitation, visibility) as measured and reported by
fixed and/or mobile environmental sensors and aggregated by the data
collector. Attributes relating to the data collection (and aggregation) are also
included.
environmental conditions data status
environmental probe data
Status of the data quality of environmental conditions data provided by a data
contributor. Includes not only status by sensor, but statistical data regarding
the quality checking of data provided.
Data from vehicle safety and convenience systems that can be used to
estimate environmental conditions, including 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. Both current
data and snapshots of recent events (e.g., traction control or anti-lock brake
system activations) may be reported.
environmental sensor data
Current road conditions (e.g., surface temperature, subsurface temperature,
moisture, icing, treatment status) and surface weather conditions (e.g., air
temperature, wind speed, precipitation, visibility) as measured and reported by
fixed and/or mobile environmental sensors. Operational status of the sensors
is also included.
environmental sensors control
Data used to configure and control environmental sensors.
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Architecture Flow Descriptions
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Architecture Flow
Description
equipment availability
An inventory of the maintenance and construction equipment available at the
storage facility. This flow includes the type of equipment, enough descriptive
information to indicate its suitability for use, and its current status. This flow
may contain information for a specific type of equipment or include all
equipment available at the facility.
equipment maintenance status
evacuation coordination
Current status of field equipment maintenance actions.
Coordination of information regarding a pending or in-process evacuation.
Includes evacuation zones, evacuation times, evacuation routes, forecast
network conditions, and reentry times.
evacuation information
Evacuation instructions and information including evacuation zones,
evacuation times, and reentry times.
event plans
Plans for major events possibly impacting traffic.
external reports
Traffic and incident information that is collected by the media through a variety
of mechanisms (e.g., radio station call-in programs, air surveillance).
fare collection data
field device status
Fare collection information including the summary of on-board fare system
data and financial payment transaction data.
Reports from field equipment (sensors, signals, signs, controllers, etc.) which
indicate current operational status.
field equipment status
freeway control data
freeway control status
Identification of field equipment requiring repair and known information about
the associated faults.
Control commands and operating parameters for ramp meters, mainline
metering/lane controls and other systems associated with freeway operations.
Current operational status and operating parameters for ramp meters, mainline
metering/lane controls and other control equipment associated with freeway
operations.
hazmat information
Information about a particular hazmat load including nature of the load and
unloading instructions. May also include hazmat vehicle route and route
update information.
hazmat information request
hazmat spill notification_ud
hri advisories
Request for information about a particular hazmat load.
Notification of Highway-Rail Intersection equipment failure, intersection
blockage, or other condition requiring attention, and maintenance activities at
or near highway rail intersections.
hri control data
Data required for HRI information transmitted at railroad grade crossings and
within railroad operations.
hri operational status
hri request
Status of the highway-rail grade crossing equipment including both the current
state or mode of operation and the current equipment condition.
A request for highway-rail intersection status or a specific control request
intended to modify HRI operation.
hri status
Status of the highway-rail intersection equipment including both the current
state or mode of operation and the current equipment condition.
incident command information coordination
Information that supports local management of an incident. It includes
resource deployment status, hazardous material information, traffic, road, and
weather conditions, evacuation advice, and other information that enables
emergency or maintenance personnel in the field to implement an effective,
safe incident response.
incident information
Notification of existence of incident and expected severity, location, time and
nature of incident. As additional information is gathered and the incident
evolves, updated incident information is provided. Incidents include any event
that impacts transportation system operation ranging from routine incidents
(e.g., disabled vehicle at the side of the road) through large-scale natural or
human-caused disasters that involve loss of life, injuries, extensive property
damage, and multi-jurisdictional response. This also includes special events,
closures, and other planned events that may impact the transportation system.
incident information for media
incident report
Report of current desensitized incident information prepared for public
dissemination through the media.
Report of an identified incident including incident location, type, severity and
other information necessary to initiate an appropriate incident response.
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Architecture Flow Descriptions
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Architecture Flow
Description
incident response coordination
Incident response procedures and current incident response status that are
shared between allied response agencies to support a coordinated response
to incidents. This flow provides current situation information, including a
summary of incident status and its impact on the transportation system and
other infrastructure, and current and planned response activities. This flow
also coordinates a positive hand off of responsibility for all or part of an
incident response between agencies.
incident response status
Status of the current incident response including a summary of incident status
and its impact on the transportation system, traffic management strategies
implemented at the site (e.g., closures, diversions, traffic signal control
overrides), and current and planned response activities.
incident status
Information gathered at the incident site that more completely characterizes
the incident and provides current incident response status.
information on violators
Information on violators provided by a law enforcement agency. May include
information about commercial vehicle violations or other kinds of violations
associated with the particular entity. The information may be provided as a
response to a real-time query or proactively by the source. The query flow is
not explicitly shown.
infrastructure monitoring sensor control
infrastructure monitoring sensor data
Data used to configure and control infrastructure monitoring sensors.
Data read from infrastructure-based sensors that monitor the condition or
integrity of transportation infrastructure including bridges, tunnels,
interchanges, pavement, culverts, signs, transit rail or guideway, and other
roadway infrastructure. Includes sensor data and the operational status of the
sensors.
interactive traveler information
Traveler information that is customized based upon traveler requests or
traveler profiles. The information is comprised of traffic and road conditions,
advisories, incidents, payment information, transit services, parking
information, weather information, and other travel-related data updates and
confirmations.
ISP coordination
Coordination and exchange of transportation information between centers.
This flow allows a broad range of transportation information collected by one
ISP to be redistributed to many other ISPs and their clients.
local signal preemption request
Direct control signal or message to a signalized intersection that results in
preemption of the current control plan and grants right-of-way to the requesting
vehicle.
local signal priority request
Request from a vehicle to a signalized intersection for priority at that
intersection.
maint and constr dispatch information
Information used to dispatch maintenance and construction vehicles,
equipment, and crews and information used to keep work zone crews
informed. This information includes routing information, traffic information,
road restrictions, incident information, environmental information, decision
support information, maintenance schedule data, dispatch instructions,
personnel assignments, alert notifications, and corrective actions.
maint and constr dispatch status
Current maintenance and construction status including work data, operator
status, crew status, and equipment status.
maint and constr equipment repair status
Current maintenance and repair status of the maintenance and construction
vehicle fleet and other support equipment. This information includes a record
of all maintenance and repair activities performed.
maint and constr fleet information
Information supporting maintenance of the maintenance and construction
vehicle fleet and other support equipment. This information includes vehicle
status and diagnostic information, vehicle utilization, and coordination of when
vehicles will be available for preventative and corrective maintenance.
maint and constr resource coordination
maint and constr resource request
Request for road maintenance and construction resources that can be used in
the diversion of traffic (cones, portable signs), clearance of a road hazard,
repair of ancillary damage, or any other incident response.
Request for road maintenance and construction resources that can be used in
the diversion of traffic (cones, portable signs), clearance of a road hazard,
repair of ancillary damage, or any other incident response. The request may
poll for resource availability or request pre-staging, staging, or immediate
dispatch of resources.
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Architecture Flow
Description
maint and constr resource response
Current status of maintenance and construction resources including availability
and deployment status. General resource inventory information covering
vehicles, equipment, materials, and people and specific resource deployment
status may be included.
maint and constr vehicle conditions
Vehicle diagnostics information that is collected, filtered, and selectively
reported by a maintenance and construction vehicle. The information includes
engine temperature, mileage, tire wear, brake wear, belt wear, and any
warnings or alarms concerning the operational condition of the vehicle and
ancillary equipment.
maint and constr vehicle location data
maint and constr vehicle location data_ud
maint and constr vehicle operational data
The current location and related status (e.g., direction and speed) of the
maintenance/construction vehicle.
The current location and related status (e.g., direction and speed) of the
maintenance/construction vehicle.
Data that describes the maintenance and construction activity performed by
the vehicle. Operational data includes materials usage (amount stored and
current application rate), operational state of the maintenance equipment (e.g.,
blade up/down, spreader pattern), vehicle safety status, and other measures
associated with the operation of a maintenance, construction, or other special
purpose vehicle. Operational data may include basic operational status of the
vehicle equipment or a more precise record of the work performed (e.g.,
application of crack sealant with precise locations and application
characteristics).
maint and constr work plans
Future construction and maintenance work schedules and activities including
anticipated closures with anticipated impact to the roadway, alternate routes,
anticipated delays, closure times, and durations.
maintenance materials storage status
multimodal service data
The amount and availability of maintenance materials in storage facilities.
Multimodal transportation schedules and other service information.
parking coordination
Information that enables parking management activities to be coordinated
between different parking operators or systems in a region.
parking demand management request
parking demand management response
Request to change the demand for parking facility use through pricing or other
mechanisms.
Response to parking demand management change requests indicating level of
compliance with request.
parking information
General parking information and current parking availability.
parking lot data request
Request for parking lot occupancy, fares, and availability. The request can
be a subscription that initiates as-needed information updates as well as a one-
time request for information.
parking lot inputs
Instructions for operation of local parking facilities to support regional traffic
management objectives (e.g. which parking lot exits to use). Also, includes
inputs from traffic sensors to support calculation of parking lot occupancy and
support more effective management of parking entrances and exits.
pass/pull-in
Command to commercial vehicle to pull into or bypass inspection station.
patient status
Information that supports assessment of the patient's condition. Information
could include general categorization of patient status, patient vital signs,
pertinent medical history, and emergency care information.
payment
Payment of some kind (e.g., toll, parking, fare) by traveler which, in most
cases, can be related to a credit account.
payment request
Request for payment from financial institution.
payment violation notification
Notification to enforcement agency of a toll, parking, or transit fare payment
violation.
rail incident response status
railroad advisories
Status of the rail system’s response to current incidents.
Real-time notification of railway-related incident or advisory.
railroad schedules
Train schedules, maintenance schedules, and other information from the
railroad that supports forecast of HRI closures.
remote surveillance control
request for payment
The control commands used to remotely operate another center's sensors or
surveillance equipment so that roadside surveillance assets can be shared by
more than one agency.
Request to deduct cost of service from user's payment account.
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Architecture Flow
Description
request for right-of-way
Forwarded request from signal prioritization, signal preemption, pedestrian
call, multi-modal crossing activation, or other source for right-of-way.
request for vehicle measures
request tag data
Request for vehicle performance and maintenance data collected by onboard
sensors.
Request for tag information including credit identity, stored value card cash,
etc.
request transit information
resource coordination
Request for transit service information and current transit status.
Coordination of resource inventory information, specific resource status
information, resource prioritization and reallocation between jurisdictions, and
specific requests for resources and responses that service those requests.
resource deployment status
resource request
Status of resource deployment identifying the resources (vehicles, equipment,
materials, and personnel) available and their current status. General resource
inventory information and specific status of deployed resources may be
included.
A request for resources to implement special traffic control measures, assist in
clean up, verify an incident, etc. The request may poll for resource availability
or request pre-staging, staging, or immediate deployment of resources.
Resources may be explicitly requested or a service may be requested and the
specific resource deployment may be determined by the responding agency.
road network conditions
Current and forecasted traffic information, road and weather conditions, traffic
incident information, and other road network status. Either raw data,
processed data, or some combination of both may be provided by this
architecture flow. Information on diversions and alternate routes, closures,
and special traffic restrictions (lane/shoulder use, weight restrictions, width
restrictions, HOV requirements) in effect is also included.
road network status assessment
Assessment of damage sustained by the road network including location and
extent of the damage, estimate of remaining capacity, required closures,
alternate routes, necessary restrictions, and time frame for repair and recovery.
road network traffic probe data
road network traffic probe data_ud
road weather information
Aggregated route usage, travel times, and other aggregated data collected
from probe vehicles that can be used to estimate current traffic conditions.
Aggregated route usage, travel times, and other aggregated data collected
from probe vehicles that can be used to estimate current traffic conditions.
Road conditions and weather information that are made available by road
maintenance operations to other transportation system operators.
roadside archive data
A broad set of data derived from roadside sensors that includes current traffic
conditions, environmental conditions, and any other data that can be directly
collected by roadside sensors. This data also indicates the status of the
sensors and reports of any identified sensor faults.
roadway information system data
Information used to initialize, configure, and control roadside systems that
provide driver information (e.g., dynamic message signs, highway advisory
radio, beacon systems). 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 systems.
roadway information system status
roadway maintenance status
safety status information
Current operating status of dynamic message signs, highway advisory radios,
beacon systems, or other configurable field equipment that provides dynamic
information to the driver.
Summary of maintenance fleet operations affecting the road network. This
includes the status of winter maintenance (snow plow schedule and current
status).
Safety information such as safety ratings, security ratings or flags, inspection
summaries, and violation summaries. A unique identifier is included.
Corresponds to the safety and security portion of CVISN "snapshots." The
status information may be provided as a response to a real-time query or as a
result of a standing request for updated information (subscription). This may
also include information about non-U.S. fleets for use by U.S. authorities, and
information regarding U.S. fleets made available to Mexican and Canadian
authorities. The query flow is not explicitly shown.
screening event record
Results of CVO electronic screening activity.
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Architecture Flow Descriptions
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Architecture Flow
Description
secure area sensor control
Information used to configure and control threat sensors (e.g., thermal,
acoustic, radiological, chemical), object, motion and intrusion detection
sensors. The provided information controls sensor data collection,
aggregation, filtering, and other local processing.
secure area sensor data
Data provided by threat sensors (e.g., thermal, acoustic, radiological,
chemical), and intrusion, motion, and object detection sensors in secure areas
indicating the sensor's operational status, raw and processed sensor data, and
alarm indicators when a threat has been detected.
secure area surveillance control
Information used to configure and control audio and video surveillance
systems used for transportation infrastructure security in secure areas. The
provided information controls surveillance data collection, aggregation,
filtering, and other local processing.
secure area surveillance data
security field equipment status
Data collected from surveillance systems used to monitor secure areas.
Includes video, audio, processed surveillance data, equipment operational
status, and alarm indicators when a threat has been detected.
Identification of security sensors and surveillance equipment requiring repair
and known information about the associated faults.
selected routes
Routes selected based on route request criteria.
short range communications status
Status of the short range communications equipment including the current
state or mode of operation and the current equipment status.
signal control data
signal control status
Information used to configure and control traffic signal systems.
Status of surface street signal controls including operating condition and
current operational state.
speed monitoring control
Information used to configure and control automated speed monitoring, speed
warning, and speed enforcement systems.
speed monitoring information
System status including current operational state and logged information
including measured speeds, warning messages displayed, and violation
records.
storage facility request
suggested route
Request for information about the equipment and/or materials available at a
maintenance storage facility.
Suggested route for a dispatched emergency or maintenance vehicle that may
reflect current network conditions and the additional routing options available
to en route emergency or maintenance vehicles that are not available to the
general public.
tag data
Unique tag ID and related vehicle information.
tag update
Data written to a tag to support electronic toll collection or parking payment.
threat information
Threats regarding transportation infrastructure, facilities, or systems detected
by a variety of methods (sensors, surveillance, threat analysis of advisories
from outside agencies, etc.
threat information coordination
toll instructions
Sensor, surveillance, and threat data including raw and processed data that is
collected by sensor and surveillance equipment located in secure areas.
Information provided to configure and support toll plaza operations including
toll pricing information.
toll transactions
track status
Detailed list of transactions from a toll station.
Current status of the wayside equipment and notification of an arriving train.
traffic archive data
Information describing the use and vehicle composition on transportation
facilities and the traffic control strategies employed. Content may include a
catalog of available information, the actual information to be archived, and
associated meta data that describes the archived information.
traffic control coordination
Information transfers that enable remote monitoring and control of traffic
management devices. This flow is intended to allow cooperative access to,
and control of, field equipment during incidents and special events and during
day-to-day operations. This flow also allows 24-hour centers to monitor and
control assets of other centers during off-hours, allows system redundancies
and fail-over capabilities to be established, and otherwise enables integrated
traffic control strategies in a region.
traffic control priority request
traffic control priority status
Request for signal priority at one or more intersections along a particular route.
Status of signal priority request functions at the roadside (e.g. enabled or
disabled).
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Architecture Flow
Description
traffic flow
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 images
High fidelity, real-time traffic images suitable for surveillance monitoring by the
operator or for use in machine vision applications. This flow includes the
images and the operational status of the surveillance system.
traffic images_ud
High fidelity, real-time traffic images suitable for surveillance monitoring by the
operator or for use in machine vision applications. This flow includes the
images and the operational status of the surveillance system.
traffic information coordination
traffic probe data
Traffic information exchanged between TMC’s. Normally would include
incidents, congestion data, traffic data, signal timing plans, and real-time
signal control information.
Vehicle data that is used to determine traffic conditions. In a basic
implementation, the data could be limited to time stamped unique identifiers
that can be used to measure a vehicle’s progress through the network. In
more advanced implementations, the vehicle may report current position,
speed, and heading and snapshots of recent events including starts and stops,
speed changes, and other information that can be used to estimate traffic
conditions.
traffic sensor control
transaction status
Information used to configure and control traffic sensor systems.
Response to transaction request. Normally dealing with a request for payment.
transit and fare schedules
Transit service information including routes, schedules, schedule adherence,
and fare information. Includes transit service information during evacuation.
transit archive data
Data used to describe and monitor transit demand, fares, operations, and
system performance. Content may include a catalog of available information,
the actual information to be archived, and associated meta data that describes
the archived information.
transit emergency data
Initial notification of transit emergency at a transit stop or on transit vehicles
and further coordination as additional details become available and the
response is coordinated.
transit fare and passenger status
transit fare information
Information provided from the traveler location that supports fare payments,
passenger data, and associated record-keeping.
Information provided by transit management that supports fare payment
transactions and passenger data collection.
transit incident information
transit information request
Information on transit incidents that impact transit services for public
dissemination.
Request for transit operations information including schedule and fare
information. The request can be a subscription that initiates as-needed
information updates as well as a one-time request for information.
transit information user request
Request for special transit routing, real-time schedule information, and
availability information.
transit multimodal information
transit probe data
Transit schedule information for coordination at modal interchange points.
Aggregate probe data derived from tracking transit vehicles. Data collected
could include transit vehicle speeds and travel times for a given link or
collection of links.
transit service coordination
transit system data
Schedule coordination information shared between local/regional transit
organizations.
Current transit system operations information indicating current transit routes,
the level of service on each route, and the progress of individual vehicles
along their routes for use in forecasting demand and estimating current
transportation network performance.
transit system status assessment
transit traveler information
Assessment of damage sustained by the public transportation system
including location and extent of the damage, current operational status
including an estimate of remaining capacity and necessary restrictions, and
time frame for repair and recovery.
Transit information prepared to support transit users and other travelers. It
contains transit schedules, real-time arrival information, fare schedules, alerts
and advisories, and general transit service information.
transit vehicle conditions
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Operating conditions of transit vehicle (e.g., engine running, oil pressure, or
mileage).
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Architecture Flow
Description
transit vehicle loading data
Data collected on board the transit vehicle relating to passenger boarding and
alighting.
transit vehicle location data
Current transit vehicle location and related operational conditions data
provided by a transit vehicle.
transit vehicle operator information
transit vehicle schedule performance
transportation network information_ud
Transit service instructions, wide area alerts, traffic information, road
conditions, and other information for both transit and paratransit operators.
Estimated times of arrival and anticipated schedule deviations reported by a
transit vehicle.
Current and forecasted traffic information, transit operations information, road
and weather conditions, traffic incident information, and other road network
status. Either raw data, processed data, or some combination of both may be
provided by this architecture flow. Information on diversions and alternate
routes, closures, and special traffic restrictions (lane/shoulder use, weight
restrictions, width restrictions, HOV requirements) in effect is also included.
Transit operations information including schedule and fare information. The
request can be a subscription that initiates as-needed information updates as
well as a one-time request for information.
transportation system status
traveler information for media
Current status and condition of transportation infrastructure (e.g., tunnels,
bridges, interchanges, TMC offices, maintenance facilities). In case of disaster
or major incident, this flow provides an assessment of damage sustained by
the surface transportation system including location and extent of the damage,
estimate of remaining capacity and necessary restrictions, and time frame for
repair and recovery.
General traveler information regarding incidents, unusual traffic conditions,
transit issues, or other advisory information that has been desensitized and
provided to the media.
traveler profile
traveler request
trip plan
Information about a traveler including equipment capabilities, personal
preferences and recurring trip characteristics.
Request by a traveler to summon assistance, request information, make a
reservation, or initiate any other traveler service.
A sequence of links and special instructions comprising of a trip plan indicating
efficient routes for navigating the links. Normally coordinated with traffic
conditions, other incidents, preemption and prioritization plans.
trip request
Request by a driver/traveler for special routing.
vehicle based information_ud
Vehicle information transmitted from on-board vehicle equipment used as part
of VII effort to communicate between vehicles and traffic management centers
via roadway equipment.
vehicle messages_ud
video images_ud
Vehicle messages used as part of VII effort to communicate with the on-board
equipment.
High fidelity, real-time video images suitable for surveillance monitoring by an
operator.
video surveillance control
violation notification
Information used to configure and control video surveillance systems.
Notification to enforcement agency of a violation. The violation notification
flow describes the statute or regulation that was violated and how it was
violated (e. g., overweight on specific axle by xxx pounds or which brake was
out of adjustment and how far out of adjustment it was). A violation differs
from a citation because it is not adjudicated by the courts.
weather information
Accumulated forecasted and current weather data (e.g., temperature,
pressure, wind speed, wind direction, humidity, precipitation, visibility, light
conditions, etc.).
work plan coordination
Coordination of work plan schedules and activities between maintenance and
construction organizations or systems. This information includes the work plan
schedules and comments and suggested changes that are exchanged as work
plans are coordinated and finalized.
work plan feedback
Comments and suggested changes to proposed construction and
maintenance work schedules and activities. This information influences work
plan schedules so that they minimize impact to other system operations and
the overall transportation system.
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Architecture Flow Descriptions
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Architecture Flow
Description
work zone information
Summary of maintenance and construction work zone activities affecting the
road network including the nature of the maintenance or construction activity,
location, impact to the roadway, expected time(s) and duration of impact,
anticipated delays, alternate routes, and suggested speed limits. This
information may be augmented with images that provide a visual indication of
current work zone status and traffic impacts.
work zone status
Current work zone status including current location (and future locations for
moving work zones), impact to the roadway, required lane shifts, expected
time(s) and duration of impact, anticipated delays, alternate routes, and
suggested speed limits.
work zone warning notification
work zone warning status
Notification of a work zone emergency or safety issue. This flow identifies that
a work zone emergency or safety issue has occurred so that warnings may be
generated by more than one system in the work zone.
Status of a work zone safety monitoring and warning devices. This flow
documents system activations and includes additional supporting information
(e.g., an image) that allows verification of the alarm.
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Architecture Flow Descriptions
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