ATMS03-Surface Street Control
Transaction Set Diagram



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The following discusses how the National ITS Architecture provides the transportation service described by this market package. Each numbered item describes the operation of that portion of the market package identified with the corresponding number on the transaction set diagram.

  1. Equipment on the Roadway is constantly monitoring traffic conditions (traffic characteristics) including volume, speed, density, etc.

  2. To obtain information about traffic on surface streets, the Traffic Management Subsystem can control (traffic sensor control) and monitor (traffic flow) sensors in or along the Roadway.

  3. Pedestrians can request right-of-way (crossing call) to cross a roadway. Equipment on the roadway notifies the pedestrian when the request has been granted (crossing permission) via display, audio signal or other manner. The roadway equipment may notify the Traffic Management Subsystem that a pedestrian has requested right-of-way and when the request was or will be granted (request for right-of-way).

  4. The Traffic Management Subsystem may also collect current traffic conditions from other centers in the region (transportation information for operations).

  5. The Traffic Management Subsystem may obtain information on traffic (traffic images) on surface streets from video equipment. The equipment can be controlled (e.g. pan/tilt/zoom) (video surveillance control) by the Traffic Management Subsystem.

  6. The entire process is under the asynchronous monitoring (traffic operator data) and control (traffic operator inputs) of Traffic Operations Personnel.

  7. Traffic Management Subsystem can configure, download timings and otherwise control (signal control data) signal equipment along the roadway to control traffic. Traffic Management Subsystem can monitor the status of this equipment (signal control status). The various equipment on the Roadway can be coordinated (roadway equipment coordination) through peer-to-peer, master-slave or other configurations. Additionally, the roadway equipment provides traffic control indications (driver information) to the driver while en-route.

Hypertext Architecture Version 6.0.0 generated on 4/23/2007 from the following databases
Physical Architecture dated 4/6/2007,
Logical Architecture dated 4/23/2007,
Market Packages dated 4/23/2007,
Security dated 4/20/2007,
User Services dated 4/9/2007,
AppMap dated 4/23/2007 and the
SDOMAP dated 4/23/2007