Instructions, Rules and Expectations for Breakout Groups presented by Vassili Alexiadis Cambridge Systematics, Inc.

Breakout Groups  Goals Define and rank NGSIM requirementsDefine and rank NGSIM requirements -Focus on practical user needs Map user requirements into algorithm requirementsMap user requirements into algorithm requirements  Methodology Use simple, common language for discussing requirementsUse simple, common language for discussing requirements -Framework: Influencing factors and behavioral algorithms -Scenarios/situations Understood by users, modelers, developersUnderstood by users, modelers, developers

Scenarios and Situations  Scenario A set of influencing factors, which a user wants to model, independent of the state of the systemA set of influencing factors, which a user wants to model, independent of the state of the system Defined using diagrams and frameworkDefined using diagrams and framework Focus on scenarios which are difficult to model correctly with existing toolsFocus on scenarios which are difficult to model correctly with existing tools Identify available data sets and algorithmsIdentify available data sets and algorithms  Situation A set of influencing factors, which a user wants to model, including the state of the systemA set of influencing factors, which a user wants to model, including the state of the system Clarify behavioral algorithm needs, within a scenarioClarify behavioral algorithm needs, within a scenario

Scenario Example Physical Network Environment System Management Elements Vehicle Characteristics Short Merge Area Ice on Surface Aggressiveness “Short Merge with Localized Ice” Traveler Characteristics Influencing factors chosen to define a scenario must be salient. Salient means that these particular influencing factors are the features of the scenario that matter or somehow differ from typical conditions

Desired Outcomes  Users and Modelers Ranked scenariosRanked scenarios  Developers Understanding of fit with commercial productsUnderstanding of fit with commercial products -Input on format and documentation of NGSIM algorithms and data sets -Input on validation procedures  Users, Modelers and Developers Potential sources of algorithms and data setsPotential sources of algorithms and data sets Structural critique: Discuss NGSIM frameworkStructural critique: Discuss NGSIM framework Process critique: Issues with processProcess critique: Issues with process