Modeling

Analysis of Channel Access Schemes for Model-based Estimation over Multi-access Networks

Huang, Ching-Ling
Sengupta, Raja
2009

This report investigates the performance of model-based estima-tion over multi-access networks and emphasizes on the estimationMSE (mean squared error) while using different channel access schemes:probabilistic (random access), deterministic (round-robin scheduling),and combined (grouped channel access). We propose a mathematicalframework for estimation over a simple multi-access MAC protocol,the slotted ALOHA network. Estimation MSE, its asymptotic be-havior and stability condition are derived for different channel accessmethods. Our quantitative discussion can provide guidelines to...

Human Driver Model Development

Cody, Delphine
Tan, Swekuang
Garcia, Aurelien
2005

This report presents the continuation of the development of a naturalistic driver model (PADRIC) initiated under MOU 369 Human driver model. The development consists of increasing the scope of simulation capabilities to lane-change maneuvers and gathering data for the calibration of the car-following mode already implemented. The first part of the report presents the development of the model architecture for integrating lane change maneuver. The second part is focused on the data collection that was conducted and proposes a discussion of the method and shortcoming for gathering the data of...

Effectiveness of Adaptive Traffic Control for Arterial Signal Management: Modeling Results

Skabardonis, Alexander
Gomes, Gabriel
2010

This study identifies and selects the most promising existing adaptive control algorithms for arterial streets, evaluates performance through simulation, and develops a plan for field testing of the most promising algorithms on a real-world arterial. A section of Highway 1 in the city of Lomita, California was selected as the test site for evaluation of adaptive signal control strategies. A methodology was developed to obtain a time-varying origin-destination (OD) matrix from the system loop detector data at the test site. The calibrated OD matrix was applied to a microscopic...

San Diego I-15 Integrated Corridor Management (ICM) System: Phase I

Miller, Mark
Novick, Linda
Li, Yuwei
Skabardonis, Alex
2008

This report describes the Stage One work of the US Department of Transportation’s (DOT) federally-sponsored Integrated Corridor Management (ICM) Program for the I-15 Corridor in San Diego County, California, between State Route 52 in the city of San Diego and State Route 78 in the city of Escondido. The development work is based on the systems engineering process whereby this work focused specifically on the concept of operations and the system requirements specifications. The development of the concept of operations consists of the following elements: vision, goals and objectives for the...

Coordination Layer Control Design for Automated Trucks and Buses

Lu, Xiao-Yun
Joo, Sungmoon
Hedrick, Karl
2004

This project studies the coordination layer control and decision making for automated trucks and buses. Maneuver design and coordination algorithms need to take several factors into consideration. Practical achievement in this project includes the following: automated ground vehicle maneuver coordination; maneuver design for automated trucks/buses; model-based simulation package development for control design and real-time code development.

Revenue Models for Advanced Traveler Information Systems

Yim, Y. B.
2001

The paper describes current trends in the traveler information supply system and the prospect for potential markets for advanced traveler information in the United States and Europe. Alternative revenue models are identified that may be able to support the operation of the newly created traveler information centers in the post-field operational test phase. In the past, public agencies have been reluctant to share traffic management responsibilities with the private sector. However, this study found that the current trend is toward a public-private partnership in the form of a franchised or...

Dynamic Origin/Destination Estimation Using True Section Densities

Sun, Carlos
Porwal, Himanshu
2000

This final report presents a practical approach for dynamic origin/destination demandestimation. The proposed dynamic origin/destination estimation framework addressesmany of the shortcomings of the existing formulations and presents a formulation forgeneral networks and not just corridors. One unique feature of this framework is its useof section density as a variable instead of flow. The framework is built upon thefoundation of static origin/destination matrix estimation by adding the temporal aspect.Two traffic assignment models, namely DYNASMART and DTA are used for assigningdynamic...

Using Cooperative Adaptive Cruise Control (CACC) to Form High-Performance Vehicle Streams. Microscopic Traffic Modeling

Liu, Hao
2018

This document summarizes the microscopic traffic simulation models used in the project entitled Using Cooperative Adaptive Cruise Control (CACC) to Form High-Performance Vehicle Streams. The major components of the microscopic traffic model include the vehicle dispatching model, human driver model and ACC/CACC model. The vehicle dispatching model determines how a modeled vehicle enters the simulation network and the distribution of different types of vehicles across the multi-lane highway. The human driver model and ACC/CACC model specify the car following and lane changing behaviors of...

National Automated Highway System Consortium: Modeling Stakeholder Preferences Project

Lathrop, John
Chen, Kan
1997

This document is the final report of the Modeling Stakeholder Preferences Project. The results of the project consist of three results: 1) evaluation framework; 2) focus group non-quantitative findings/ recommendations; and, 3) performance/impact measures, their endpoints, rankings and weights, for each stakeholder group.

Transient Platoon Aerodynamics During Passing Maneuvers and In-line Oscillations

Tsuei, J. L.
Savas, O.
Hedrick, J. K.
2000

The transient aerodynamic effects in a four-vehicle platoon during passing maneuvers and in-line oscillations are investigated. A vehicle model is moved longitudinally parallel to a four-car platoon to simulate passing maneuvers. The drag and side forces experienced by each platoon member are measure using strain gauge balances. The resulting data are presented as dimensionless coefficients. It is show that each car in the platoon experiences a repulsive side force when the passing vehicle is in the neighborhood of its rear half. The side force reverses its direction and becomes an...