High-Level Requirements for the US-75 Integrated Corridor in Dallas, Texas
April 30, 2008
Award# DTFH-61-06-H-00040
8. Glossary
This section defines the terms and definitions used in the requirements document.
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Real-time - receipt or calculation of conditions within 2 minutes of occurrence
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Near real-time - receipt or calculation of conditions more than 2 minutes of occurrence, but within 30 minutes of occurrence
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Status - condition of infrastructure
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Active - not marked as out-of-order or in-maintenance
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Link - the portion of a model connecting two nodes. The link is defined within the model as:
- facility type
- number of lanes
- capacity per lane
- speed limit
- average jam density
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Node - point of branching of physical connections, or terminating a physical connection within a simulation model
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Average Jam Density - the maximum number of vehicles per unit length of the highway link
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Intermodal network conditions - current status and state of modes of travel within the network
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Consistency - the system's estimation error will fall within a pre-determined range
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Real-world conditions - model capabilities to match conditions of actual network
- The system's estimation error of the traffic speed, density and volume on every highway link in the network should not exceed 15% (plus or minus).
- The system's estimation error of the location of every transit vehicle in the network should not exceed 10% (plus or minus).
- The system's estimation error of the occupancy of every park-and-ride facility in the network should not exceed 20% (plus or minus).
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Corridor management strategy - management plan for an event or incident within the corridor. These strategies include:
- pre-trip and en-route traveler information provision
- congestion pricing
- signal timing modification
- transit service modification
- transit signal priority
- parking management and pricing
- combinations of the above
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Traffic Management Scheme - A traffic management scheme consists of the different actions that will be implemented by all agencies to manage the corridor. These actions are:
- List of Dynamic Message Signs (DMS) to be activated along with their messages
- Transit vehicle service pattern including any route and headway modifications
- Timing plan of all signalized intersections
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Environment-oriented - factor relating to the environment of the system
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Decision Support Subsystem - a server or set of servers within the ICMS utilized for current and predictive modeling of the corridor in order to develop response plans to current and predictive incidents.
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Evaluation Model Subsystem - a server or set of servers within the ICMS utilized to calculate the performance measures of the corridor and evaluate the response plans developed for use within the corridor
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Web Subsystem - a server or set of servers within the ICMS which provide a web accessible view into the ICMS data. The system will allow authorized users to view, edit, create, query, and develop reports from the ICMS database.
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Decision Support Interface - The web view of the ICMS data provided to the Agency users.
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Database Subsystem - a server or set of servers within the ICMS which receive, store, and sends data from external systems and internally within the ICMS.