North Texas Tollway Authority Traffic Management Center - Traffic Management Functionality

Subsystem Description

FWTAraffic Management Subsystem (TMS) 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. This subsystem communicates with the Roadway Subsystem to monitor and manage traffic flow and monitor the condition of the roadway, surrounding environmental conditions, and field equipment status. This subsystem coordinates with the Maintenance and Construction Management Subsystem to maintain the road network and coordinate and adapt to maintenance activities, closures, and detours. Incidents are detected, verified, and incident information is provided to allied agencies, drivers (through Roadway Subsystem highway advisory radio and dynamic message signs), and information service providers. This subsystem also manages traffic and transportation resources to support allied agencies in responding to, and recovering from, incidents ranging from minor traffic incidents through major disasters. When required, special traffic management strategies are implemented to support evacuation and reentry. FWTAraffic Management Subsystem supports HOV lane management and coordination, road pricing, and other demand management policies that can alleviate congestion and influence mode selection. It also manages reversible lane facilities and barrier and safeguard systems that control access to transportation infrastructure. The subsystem communicates with other Traffic Management Subsystems to coordinate traffic information and control strategies in neighboring jurisdictions. It also coordinates with rail operations to support safer and more efficient highway traffic management at highway-rail intersections. Finally, the Traffic Management Subsystem provides the capabilities to exercise control over those devices utilized for automated highway system (AHS) traffic and vehicle control.

Functional Area: Collect Traffic Surveillance

Management of traffic sensors and surveillance (CCTV) equipment, collection of current traffic conditions, and distribution of the collected information to other centers and operators.

ID Requirement Status
1 The center shall monitor, analyze, and store traffic sensor data (speed, volume, occupancy) collected from field elements under remote control of the center. Existing
2 The center shall monitor, analyze, and distribute traffic images from CCTV systems under remote control of the center. Existing
4 The center shall distribute road network conditions data (raw or processed) based on collected and analyzed traffic sensor and surveillance data to other centers. Existing
5 The center shall respond to control data from center personnel regarding sensor and surveillance data collection, analysis, storage, and distribution. Existing
6 The center shall maintain a database of surveillance equipment and sensors and associated data (including the roadway on which they are located, the type of data collected, and the ownership of each ) Existing

Functional Area: TMC Incident Detection

Remotely monitors traffic sensor and surveillance systems to detect and verify incidents. Also monitors external advisory and incident reporting systems, intermodal freight depots, and border crossings for additional incident information. Identified incidents are reported to operations personnel and other centers.

ID Requirement Status
2 The center shall collect and store traffic flow and image data from the field equipment to detect and verify incidents. Existing
7 The center shall provide video and traffic sensor control commands to the field equipment to detect and verify incidents. Existing

Functional Area: TMC Incident Dispatch Coordination/Communication

Formulates an incident response that takes into account the incident potential, incident impacts, and/or resources required for incident management. Facilitates the dispatch of emergency response and service vehicles and coordinates the response with cooperating agencies.

ID Requirement Status
8 The center shall monitor incident response performance and calculate incident response and clearance times. Existing
12 The center shall support an interface with a map update provider, or other appropriate data sources, through which updates of digitized map data can be obtained and used as a background for traffic incident management. Existing

Functional Area: TMC Signal Control

Remotely controls traffic signal controllers to implement traffic management strategies at signalized intersections based on traffic conditions, incidents, emergency vehicle preemptions, pedestrian crossings, etc.

ID Requirement Status
1 The center shall remotely control traffic signal controllers. Existing
3 The center shall collect traffic signal controller operational status and compare against the control information sent by the center. Existing
8 The center shall maintain traffic signal coordination including synchronizing clocks throughout the system. Existing

Functional Area: TMC Traffic Information Dissemination

Controls dissemination of traffic-related data to other centers, the media, and travelers via the driver information systems (DMS, HAR) that it operates.

ID Requirement Status
1 The center shall remotely control dynamic messages signs for dissemination of traffic and other information to drivers. Existing
3 The center shall collect operational status for the driver information systems equipment (DMS, HAR, etc.). Existing
5 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. Existing
8 The center shall provide the capability for center personnel to control the nature of the data that is available to non-traffic operations centers and the media. Existing

Functional Area: TMC Traffic Management Decision Support

Recommends courses of action to the traffic operator based on current and forecast road and traffic conditions. Recommended actions may include predefined incident response plans, signal timing plan changes, DMS/HAR messages, lane control strategies, metering strategies, etc.

Functional Area: TMC Traffic Network Performance Evaluation

Measures performance and predicts travel demand patterns to support traffic flow optimization, demand management, and incident management. Collects data from surveillance equipment as well as input from other management centers including emissions, event promoters, and other TMCs.

Functional Area: TMC Transportation Operations Data Collection

Collects real-time information on the state of the regional transportation system for operational use by the center. It establishes communications with a regional repository, requests or subscribes to information relevant to the center, and distributes the received information for use.

ID Requirement Status
1 The center shall collect real-time information on the state of the regional transportation system including current traffic and road conditions, weather conditions, special event and incident information. Existing
2 The center shall support the capability for the system operator to monitor and control the information collection service. Existing

Functional Area: Traffic Data Collection

Collection and storage of traffic management data. For use by operations personnel or data archives in the region.

ID Requirement Status
1 The center shall collect traffic management data such as operational data, event logs, etc. Existing
2 The center shall assign quality control metrics and meta-data to be stored along with the data. Meta-data may include attributes that describe the source and quality of the data and the conditions surrounding the collection of the data. Medium-term
3 The center shall receive and respond to requests from ITS Archives for either a catalog of the traffic data or for the data itself. Existing
4 The center shall be able to produce sample products of the data available. Existing