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VDOT NRO MPSTOC - TOC Field Equipment

Status:

Existing

Definition:

These devices are typically located along the roadside and are controlled by operators in the TOC which aids them in monitoring and managing traffic conditions. The field that aids operators in performing their functions are: VMS, Reversible HOV, HAR, Ramp Meters, Vehicle Detection, Lane Control Signals, Call Boxes, CCTV, and truck rollover systems that monitor the height and speed of trucks to determine potential rollovers on road curves.

Stakeholder:

VDOT NRO

Architecture Flow Diagrams
which include VDOT NRO MPSTOC - TOC Field Equipment:

• VDOT NRO MPSTOC - TOC Field Equipment VDOT NRO MPSTOC - TOC
• VDOT NRO MPSTOC - TOC Field Equipment VDOT NRO TFO

Architecture Flows
to/from the VDOT NRO MPSTOC - TOC Field Equipment:

VDOT NRO MPSTOC - TOC Field Equipment VDOT NRO MPSTOC - TOC

• barrier system status


• environmental sensor data


• freeway control status


• hov data


• hri status


• intersection blockage notification


• request for right-of-way


• reversible lane status


• roadway information system status


• signal control status


• speed monitoring information


• traffic flow


• traffic images


• traffic probe data

VDOT NRO MPSTOC - TOC Field Equipment VDOT NRO TFO

• barrier system status


• environmental sensor data


• freeway control status


• hov data


• hri status


• intersection blockage notification


• request for right-of-way


• reversible lane status


• roadway information system status


• signal control status


• speed monitoring information


• traffic flow


• traffic images


• traffic probe data

VDOT NRO MPSTOC - TOCVDOT NRO MPSTOC - TOC Field Equipment

• barrier system control


• environmental sensors control


• freeway control data


• hri control data


• hri request


• reversible lane control


• roadway information system data


• signal control data


• speed monitoring control


• traffic sensor control


• vehicle signage data


• video surveillance control

VDOT NRO TFOVDOT NRO MPSTOC - TOC Field Equipment

• speed monitoring control


• traffic sensor control


• vehicle signage data


• video surveillance control

National ITS Architecture Subsystems
mapped to the VDOT NRO MPSTOC - TOC Field Equipment:

• Roadway Subsystem

National ITS Architecture Services
associated with VDOT NRO MPSTOC - TOC Field Equipment:

• ATMS01 - Network Surveillance - VDOT NRO MPSTOC -- (Graphic)
• ATMS04 - Freeway Control - VDOT NRO MPSTOC -- (Graphic)
• ATMS19 - Speed Monitoring - VDOT NOVA District -- (Graphic)
• MC08 - Work Zone Management - VDOT NOVA District -- (Graphic)

National ITS Architecture Functional Requirements
associated with VDOT NRO MPSTOC - TOC Field Equipment:

Roadway Basic Surveillance

1. 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.
2. The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
3. The field element shall collect, digitize, and send multimodal crossing and high occupancy vehicle (HOV) lane sensor data to the center for further analysis and storage.
4. The field element shall return sensor and CCTV system operational status to the controlling center.
5. The field element shall return sensor and CCTV system fault data to the controlling center for repair.

Roadway Probe Data Communications

1. The field element shall communicate with on-board equipment on passing vehicles to collect current status information and a record of previous events (e.g., temperature, wiper status, headlight status, traction control system status) that can be used to determine road and surface weather conditions.
2. The field element shall aggregate and forward collected probe information to the center.

Roadway Freeway Control

1. The field element shall include ramp metering controllers, mainline meters, and lane controls for use on freeways, under center control.
2. The field element shall monitor operation of ramp meter, mainline meters, and lane control indicators and report to the center any instances in which the indicator response does not match that expected from the indicator control information.
3. The field element shall monitor operation of ramp meter, mainline meters, and lane control indicators and report to the center any instances in which the indicator response does not match that expected from known indicator preemptions.
4. The field element shall return ramp metering controller, mainline meters, and lane control operational status to the controlling center.
5. The field element shall return ramp metering controller, mainline meters, and lane control fault data to the maintenance center for repair.
6. The field element shall provide indications to the driver that a freeway ramp or a lane is available for use, with possible usage data for the freeway lanes they are entering.

Roadway HOV Control

1. The field element shall include sensors to detect high-occupancy vehicle (HOV) lane usage, under center control.
2. The field element shall include driver information systems to notify users of lane status for lanes that become HOV or High Occupancy Toll (HOT) lanes during certain times of the day on freeways, under center control.
3. The field element shall include freeway control devices, such as ramp signals and mainline metering and other systems associated with freeway operations that control use of HOV lanes, under center control.
4. The field element shall provide traffic flow measures and information regarding vehicle occupancy (i.e., lane usage) in HOV lanes to the center.
5. The field element shall return operational status for the HOV lane sensors to the controlling center.
6. The field element shall return fault data for the HOV lane sensors to the center for repair.

Roadway Traffic Information Dissemination

1. The field element shall include dynamic messages 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).
2. The field element shall include driver information systems that communicate directly from a center to the vehicle radio (such as Highway Advisory Radios) for dissemination of traffic and other information to drivers, under center control.
3. The field element shall provide operational status for the driver information systems equipment (DMS, HAR, etc.) to the center.
4. The field element shall provide fault data for the driver information systems equipment (DMS, HAR, etc.) to the center for repair.

Roadway Incident Detection

1. The field element shall collect, process, and send traffic images to the center for further analysis and distribution.
2. The field element shall remotely process video data and provide an indication of potential incidents to the traffic management center.
3. The field element's video devices shall be remotely controlled by a traffic management center.
4. The field element shall provide operational status and fault data for the incident detection devices to the traffic management center.

Field Barrier System Control

1. The field element shall activate barrier systems for transportation facilities and infrastructure under center control. Barrier systems include automated or remotely controlled gates, barriers and other systems that manage entry to roadways.
2. The field element shall return barrier system operational status to the controlling center.
3. The field element shall return barrier system fault data to the maintenance center for repair.

Roadway Reversible Lanes

1. The field element shall monitor traffic in reversible lanes, including wrong-way vehicles, using sensors and surveillance equipment under center control.
2. The field element shall provide operational status for the reversible lane field equipment to the center.
3. The field element shall provide fault data for the reversible lane field equipment to the center.

Roadway Speed Monitoring

1. The field element shall include sensors to detect vehicle speeds, under traffic or maintenance center control.
2. If the speed detected by vehicle speed sensors is determined to be excessive, the field element shall provide a safe speed advisory to passing drivers via a driver information system (such as portable messages signs, field to vehicle communications to in-vehicle signing systems, etc.).
3. The field element shall return operational status for the vehicle speed sensors to the enforcement agency.
4. The field element shall return fault data for the vehicle speed sensors to the controlling center for repair.