Data

Data Sharing of Traveler Information with the Public and Private Sectors: State of the Practice

Miller, Mark A.
Balke, Kevin
2001

This report presents the results of its examination of the current state of the practice of traveler information data sharing with the public and private sectors. A review of the literature was initially performed followed by an analysis of responses to a survey instrument that was designed and administered to practitioners in the field, primarily representatives from public sector agencies, who are in the business of collecting traveler information data. Survey results have addressed the subjects of what data is shared, with whom it is shared, why it is shared, how it is institutionally...

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...

Studies of Collisions and Control Strategies in Vehicle Following Operations by Two-Dimensional Impact Simulation

Chan, Ching-Yao
2000

The major accomplishments from this project can be categorized into the following areas: (1) Adoption of a vehicle-collision simulation tool with an interface that allows the implementation of feedback controller. (2) Thorough analysis and modeling of vehicle lateral dynamics in collision situations, which permits the selection and design of controllers for emergency conditions. (3) Validation of feasibility of applying steering control in vehicle-following conditions to stabilize vehicle trajectories, thus establishing an option of control strategies in safety-critical operations. To...

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...

Section-Related Measures of Traffic System Performance: Prototype Field Implementation

Ritchie, Stephen G.
Sun, Carlos
Oh, Seri
Oh, Cheol
2001

In this project (MOU 336),an initial phase of a field implementation was accomplished of the results of a previous research project (MOU 224),in which a vehicle reidentification algorithm based on loop signature analysis was developed using freeway traffic data.This algorithm was extended to non-freeway cases, initially using a section of 2-lane major arterial in cooperation with the City of Irvine,California.The technique was enhanced to address problems such as "irregularities " in vehicle signatures associated with trucks,tail-gating vehicles and erroneous counting of vehicles,with the...

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...

Platoon Collision Dynamics And Emergency Maneuvering I: Reduced Order Modeling Of A Platoon For Dynamical Analysis

Tongue, Benson H.
Yang, Yean-tzong
White, Matthew T.
1991

The purpose of this three-year project is to develop an operational model of vehicle platoon dynamics under emergency conditions and to evaluate the platoon's dynamical behavior under non-nominal, or emergency, conditions. New platoon protocols and/or controller modifications will be formulated after analyzing the platoon response data in order to minimize damage to the platoon and the vehicles' occupants. This progress report discusses the results of the modeling phase of this work. A detailed literature review is included as Appendix B.

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test Volume 2: FOT Objectives, Organization, System Design, Results, Conclusions and Recommendations

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test (FOT) evaluated the performance of wireless traffic detection and communications systems in areas where permanent detectors, electrical power, and landline communications were not available. The FOT partners designed and built six surveillance and three ramp meter trailers, a video and data retransmission or relay site, and video and data reception facilities at the Caltrans District 12 and Anaheim Traffic Management Center (TMCs) and the University of California at Irvine Institute of Transportation Studies(...

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...