Next Generation Simulation Core Algorithms and Data Sets DTFH61-02-R-00036

presented by

Vassili Alexiadis Cambridge Systematics, Inc.

Project Approach

Identify and Prioritize Core Algorithm Categories High-Level Plan and Assessment for Core Algorithms High-Level Plan for Validation Data Requirements Algorithm Development, Validation, and Data Collection High-Level Plan for Data Sets Data Formats Establish NGSIM Data Formats

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Algorithms, Software for Testing, and Documentation Validation Databases and Procedures Validation Data Establish and Maintain Web Site and Repository Interaction with the Stakeholder Group and User Community Project Management and Program Support

Project Organization

Federal Highway Administration John Halkias Gene McHale Quality Assurance/ Quality Control Lance Neumann (CS) Cambridge Systematics, Inc.

Vassili Alexiadis (CS)

Principal Investigator

Mitretek Senior Advisors Moshe Ben-Akiva (MIT) Alexander Skabardonis (UCB) Hani Mahmassani (UMD) Pitu Mirchandani (UAZ) Panos Michalopoulos (UMN) Project Management Vassili Alexiadis (CS) Vassili Alexiadis (CS) Data Sets Stakeholders Richard Margiotta (CS) Web Site Nathan Clark (CS) Core Algorithms Larry Head (SGTS) Validation Data Formats Richard Margiotta (CS) Richard Dowling (DA)

Website http://ngsim.fhwa.dot.gov

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Objectives

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Provide a user-friendly environment for NGSIM information

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Provide a community workplace Provide software, data, and documentation repository Allow for algorithm/data project management

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Functionality

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NGSIM program information

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News and event items User registration capabilities Document downloads

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Manage program documents Links to other relevant efforts NGSIM team, stakeholder and public discussions

Website http://ngsim.fhwa.dot.gov

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Using the site: Register, via the front page View the ‘documents’ section, for relevant downloads Check the site weekly, for news and events updates Participate in discussion lists

Previous Requirements Work

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FHWA-led workshops

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Identified basic requirements Ranked requirements, based on need

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Overlap with this workshop

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Focused on micro-simulation models

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Differences: this workshop is:

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Not focused on developing a full NGSIM model

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Focused on core behavioral algorithms

Workshop Objectives

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Requirements elicitation

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Users: What needs to be advanced in the state of the practice?

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Modelers: What needs to be advanced in the state of the art?

Developers: How should NGSIM be formulated to be useful to software developers?

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Requirements prioritization

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Users: based on need

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Modelers: based on development risk Developers: based on development cost

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Identify available data sets and algorithms

Workshop Agenda

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Monday

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8:30 - noon: Plenary session

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Noon - 1:00: Lunch (group) 1:00 - 5:00: Breakout sessions (Users, Modelers, Developers) 5:00 - 7:00: Social (Hors d'oeuvre and cash bar)

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Tuesday

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8:00 - 10:00: Plenary session

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10:00 - 1:00: Breakout sessions 2:00 - 5:00: Individual meetings with developers, as needed

Workshop Format

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Users and Modelers

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Identify and rank requirements

In reference to specific modeling scenarios/situations As combinations of influencing factors that affect travel behavior (list is provided in breakout material) •

Describe a few scenarios that you want to model adequately, but feel you cannot; May include scenarios you have or have not attempted to model

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Developers

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Input on format and documentation of NGSIM algorithms and data sets

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Identify potential sources of algorithms and data sets Input on validation procedures

Workshop Rationale

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Workshop purpose

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Identify those factors that are most important to users and use this information to shape focus efforts on behavioral algorithms

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Practical focus - Not theoretical focus Supplemental - Not a wholesale rethinking of ongoing FHWA needs assessment

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Example

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Users: Current models do not do a good job in modeling ramp metered freeways under bad weather conditions

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NGSIM focus on car following and lane changing under these conditions. Gather data sets, and develop/test algorithms to model lane changing or car following under these conditions.

Desired Outcomes

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Simulation model requirements

Through identification and ranking of scenarios/situations •

Structural critique

Discuss NGSIM framework •

Process critique

Issues with process •

Input on format and documentation of NGSIM algorithms and data sets Potential sources of algorithms and data sets Input on validation procedures