MPC
Research Projects (2006-07)

Identifying Number

MPC-282

Project Title

Calibration and Validation of I-15 VISSIM model through a Genetic Algorithm, Part 1B

University

University of Utah

Project Investigator:

Peter T. Martin, Associate Professor
Dept. Of Civil and Environmental Engineering
University of Utah

External Project Contact

Rukhsana (Shana) Lindsey, P.E.
Director of Research & Bridge Operations
4501 S. 2700 W. - Box 148410
Salt Lake City, UT 84114-8410
Office: (801) 965-4196
Fax: (801) 965- 4564
E-mail: rlindsey@utah.gov

Project Objective

The purpose of this project is to build, calibrate, and validate VISSIM model of I-15 from SR 201 (or 600 N) to University Parkway. UDOT has started developing a VISSIM microsimulation model for evaluation of the HOT lanes on I-15 from SR 201 to University Parkway. Microsimulation models are required tools for evaluation of HOV and HOT facilities. However, microsimulation models require much more details when buildings and calibrating the models. The calibration of microsimulation parameters (e.g. car-following parameters, speed and acceleration distributions) is very essential to validate simulations results with the observed performance measures.

Project Abstract

When traffic engineers build sophisticated traffic micro-simulations of their networks, the process is detailed and time consuming. Calibration of the networks is the process whereby algorithmic controls are manipulated so that the model reflects reality realistically. In the past, this process was quick and usually heuristic. Today, as the tool are increasingly complex, the process is much more demanding. This project develops a state-of-the-art approach to calibration through the application of a Genetic Algorithm which we calibrate a network rigorously.

Research Objectives

1. Identify the proper calibration methodologies considering various possible scenarios
2. Design data collection plan and conduct the data collection in the pre-selected test beds
3. Compare and evaluate simulated and measured travel variables and make recommendations

Task Descriptions

1. Develop detailed project scope
2. Prepare brief literature review
3. Propose research methodology (data collection, calibration, validation)
4. Integrate material and data already developed and gathered by UDOT
5. Collect data (Flows & speeds (UTL - real time connection to the TMS data), Travel time runs - GPS data, etc.)
6. Calibrate VISSIM model by using Genetic Algorithm or other optimization searching tools
7. Validate VISSIM model for an independent data set (not used in calibration)
8. Report findings to UDOT
9. Deploy Genetic Algorithm calibration tool in UDOT Planning Division

Milestones, Dates

Item	To Be Completed By	Payment (%Effort)
Formation of Technical Advisory Committee	July 1, 2006	0%
Agreement on Work Task/Project Scopes	July 30,2006	10%
Submit Draft Technical Report	December 30, 2006	60%
Submit Final Technical report	June 30, 2007	30%

Yearly and Total Budget

$59,700

Student Involvement

Four graduate research assistants will be employed on the project.

Relationship to Other Research Projects

This project is new and has no relationship to others.

Technology Transfer Activities

Data sharing; database development

Potential Benefits of the Project

The proper validation of simulation parameters will enable successful evaluation of the proposed HOT lanes on I-15. Utah Traffic Lab has a lot of experience in building and calibrating VISSIM and VISUM models.

TRB Keywords

Traffic operations; traffic control; safety; emergency planning