Next Generation Simulation Core Next Generation Simulation Core Algorithms and Data SetsAlgorithms and Data Sets

presented bypresented by

Vassili AlexiadisVassili Alexiadis

Cambridge Systematics, Inc.Cambridge Systematics, Inc.

DTFH61-02-R-00036DTFH61-02-R-00036

High-Level Plan High-Level Plan for Validationfor Validation

High-Level Plan High-Level Plan for Data Setsfor Data Sets

Identify and Identify and Prioritize Core Prioritize Core

Algorithm Algorithm CategoriesCategories

Establish NGSIM Establish NGSIM Data FormatsData Formats

Establish and Maintain Web Site and RepositoryEstablish and Maintain Web Site and Repository

Interaction with the Stakeholder Group and User CommunityInteraction with the Stakeholder Group and User Community

Project Management and Program SupportProject Management and Program Support

High-Level Plan and High-Level Plan and Assessment for Assessment for Core AlgorithmsCore Algorithms

Pri

ori

tize

d C

ore

Alg

ori

thm

sP

rio

riti

zed

Co

re A

lgo

rith

ms

Data FormatsData Formats

• Algorithms, SoftwareAlgorithms, Softwarefor Testing, and for Testing, and DocumentationDocumentation

• Validation DatabasesValidation Databasesand Proceduresand Procedures

• Validation DataValidation Data

Data RequirementsData Requirements

Algorithm Algorithm Development, Development,

Validation, and Validation, and Data CollectionData Collection

Project ApproachProject Approach

Project OrganizationProject Organization

Quality Assurance/Quality Assurance/Quality ControlQuality Control

Lance Neumann (CS)Lance Neumann (CS)Moshe Ben-Akiva (MIT)Moshe Ben-Akiva (MIT)

Alexander Skabardonis (UCB)Alexander Skabardonis (UCB)

Hani Mahmassani (UMD)Hani Mahmassani (UMD)

Pitu Mirchandani (UAZ)Pitu Mirchandani (UAZ)

Panos Michalopoulos (UMN)Panos Michalopoulos (UMN)

Senior AdvisorsSenior Advisors

Core AlgorithmsCore Algorithms

Larry Head (SGTS)Larry Head (SGTS)

Web SiteWeb Site

Nathan Clark (CS)Nathan Clark (CS)

ValidationValidation

Richard Dowling (DA)Richard Dowling (DA)

Data SetsData Sets

Richard Margiotta (CS)Richard Margiotta (CS)

Project ManagementProject Management

Vassili Alexiadis (CS)Vassili Alexiadis (CS)

Data FormatsData Formats

Richard Margiotta (CS)Richard Margiotta (CS)

StakeholdersStakeholders

Vassili Alexiadis (CS)Vassili Alexiadis (CS)

Federal Highway Federal Highway AdministrationAdministration

Cambridge Systematics, Inc.Cambridge Systematics, Inc.

Vassili Alexiadis (CS)Vassili Alexiadis (CS)

Principal InvestigatorPrincipal Investigator

John HalkiasJohn Halkias

Gene McHaleGene McHaleMitretekMitretek

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

ObjectivesObjectives• Provide a user-friendly environment for NGSIM informationProvide a user-friendly environment for NGSIM information• Provide a community workplaceProvide a community workplace• Provide software, data, and documentation repositoryProvide software, data, and documentation repository• Allow for algorithm/data project managementAllow for algorithm/data project management

Functionality Functionality

• NGSIM program informationNGSIM program information

• News and event itemsNews and event items

• User registration capabilitiesUser registration capabilities

• Document downloads Document downloads

• Manage program documentsManage program documents

• Links to other relevant effortsLinks to other relevant efforts

• NGSIM team, stakeholder and public discussionsNGSIM team, stakeholder and public discussions

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

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

Previous Requirements WorkPrevious Requirements Work

FHWA-led workshopsFHWA-led workshops

• Identified basic requirementsIdentified basic requirements

• Ranked requirements, based on needRanked requirements, based on need

Overlap with this workshopOverlap with this workshop

• Focused on micro-simulation modelsFocused on micro-simulation models

Differences: this workshop is:Differences: this workshop is:

• Not focused on developing a full NGSIM modelNot focused on developing a full NGSIM model

• Focused on core behavioral algorithmsFocused on core behavioral algorithms

Workshop ObjectivesWorkshop Objectives

Requirements elicitation Requirements elicitation

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

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

• DevelopersDevelopers: How should NGSIM be formulated to be useful : How should NGSIM be formulated to be useful to software developers?to software developers?

Requirements prioritizationRequirements prioritization

• UsersUsers: based on need: based on need

• ModelersModelers: based on development risk: based on development risk

• DevelopersDevelopers: based on development cost: based on development cost

Identify available data sets and algorithmsIdentify available data sets and algorithms

Workshop AgendaWorkshop Agenda

MondayMonday

• 8:30 - noon: Plenary session8:30 - noon: Plenary session

• Noon - 1:00: Lunch (group)Noon - 1:00: Lunch (group)

• 1:00 - 5:00: Breakout sessions (Users, Modelers, Developers)1:00 - 5:00: Breakout sessions (Users, Modelers, Developers)

• 5:00 - 7:00: Social (Hors d'oeuvre and cash bar)5:00 - 7:00: Social (Hors d'oeuvre and cash bar)

TuesdayTuesday

• 8:00 - 10:00: Plenary session8:00 - 10:00: Plenary session

• 10:00 - 1:00: Breakout sessions10:00 - 1:00: Breakout sessions

• 2:00 - 5:00: Individual meetings with developers, as needed2:00 - 5:00: Individual meetings with developers, as needed

Workshop FormatWorkshop Format

Users and ModelersUsers and Modelers

• Identify and rank requirementsIdentify and rank requirements

- In reference to specific modeling scenarios/situations In reference to specific modeling scenarios/situations

- As combinations of influencing factors that affect travel As combinations of influencing factors that affect travel behavior (list is provided in breakout material)behavior (list is provided in breakout material)

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

DevelopersDevelopers

• Input on format and documentation of NGSIM algorithms Input on format and documentation of NGSIM algorithms and data setsand data sets

• Identify potential sources of algorithms and data setsIdentify potential sources of algorithms and data sets

• Input on validation proceduresInput on validation procedures

Workshop RationaleWorkshop Rationale

Workshop purpose Workshop purpose

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

• Practical focus - Not theoretical focusPractical focus - Not theoretical focus

• Supplemental - Not a wholesale rethinking of ongoing FHWA Supplemental - Not a wholesale rethinking of ongoing FHWA needs assessmentneeds assessment

ExampleExample

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

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

Desired OutcomesDesired Outcomes

• Simulation model requirementsSimulation model requirements

- Through identification and ranking of scenarios/situationsThrough identification and ranking of scenarios/situations

• Structural critiqueStructural critique

- Discuss NGSIM frameworkDiscuss NGSIM framework

• Process critiqueProcess critique

- Issues with processIssues with process

• Input on format and documentation of NGSIM algorithms and Input on format and documentation of NGSIM algorithms and data setsdata sets

• Potential sources of algorithms and data setsPotential sources of algorithms and data sets

• Input on validation proceduresInput on validation procedures