WSDOT SC Region TMC - Traffic Management Functionality

Subsystem Description

The Traffic 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. The Traffic 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: TMC Environmental Monitoring

Management of environmental sensors and assimilation of collected data with other current and forecast road conditions and surface weather information from weather service providers and roadway maintenance operations.

1The center shall remotely control environmental sensors that measure road surface temperature, moisture, icing, salinity, and other measures.Existing
2The center shall remotely control environmental sensors that measure weather conditions including temperature, wind, humidity, precipitation, and visibility.Existing
3The center shall assimilate current and forecast road conditions and surface weather information using a combination of weather service provider information (such as the National Weather Service and value-added sector specific meteorological services), data from roadway maintenance operations, and environmental data collected from sensors deployed on and about the roadway.Existing
4The center shall provide weather and road condition information to weather service providers and center personnel.Existing
5The center shall respond to control data from center personnel regarding environmental sensor control and weather data collection and processing.Existing

Functional Area: TMC Roadway Warning

Remotely monitors and controls field elements used to warn drivers approaching hazards. Detects and warns approaching vehicles of adverse road weather conditions, traffic conditions including queues, and obstacles or animals in the road.

1The center shall monitor data on traffic, environmental conditions, and other hazards collected from sensors along the roadway.Existing
2The center shall identify hazardous road weather and surface conditions.Existing
3The center shall identify hazardous traffic conditions including queues.Existing
5The center shall issue control commands to field equipment warning drivers approaching the identified hazardous conditions.Existing
6The center shall monitor the operational status of the dynamic warning equipment, including fault reports.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.

1The center shall remotely control traffic signal controllers.Existing
3The center shall collect traffic signal controller operational status and compare against the control information sent by the center.Existing
4The center shall collect traffic signal controller fault data from the field.Existing
5The center shall manage (define, store and modify) control plans to coordinate signalized intersections, to be engaged at the direction of center personnel or according to a daily schedule.Existing
6The center shall implement control plans to coordinate signalized intersections based on data from sensors.Existing
8The center shall maintain traffic signal coordination including synchronizing clocks throughout the system.Existing

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.

1The 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