PATH

"Study of Traffic at a Freeway Merge and Roles for Ramp Metering"

Cassidy, Michael J.
Rudjanakanoknad, Jittichai
2002

Traffic data measured near the junction of a single-lane on-ramp (with metered inflows) and a three-lane freeway were carefully studied for four days during the rush. The data showed the area around this merge junction became a bottleneck each day when the on-ramp's meter allowed its inflows to rise in the presence of high flows arriving from the freeway. Detailed study during these times further showed that queueing actually arose some distance downstream of the merge and that these queues were caused by drivers who, having just entered the freeway's shoulder lane from the on-ramp, slowed...

Median Light Rail Crossing: Accident Causation And Countermeasures

Coifman, Benjamin
Bertini, Robert L.
1997

This paper focuses on accident causation and countermeasures at arterial median light rail grade crossings. It synthesizes accident causation and prevention literature from several fields, including traffic engineering, human factors and cognitive psychology, as it relates to the complex LRT grade crossing.

Travinfo Evaluation: Institutional Element Phase 2 Results

Hall, R.
Loukakos, D.
Weissenberger, S.
Yim, Y. B.
1996

This report presents the results of year two of the institutional evaluation of the TravInfo Field Operational Test (FOT). Numerous core participants and committee members were interviewed. The second year was dominated by TravInfo implementation issues, chief among which were: resolution of public/private controversies in the design of TravInfo and the attempt to ensure the completion of Caltrans' Traffic Operations System (TOS) for meeting the TravInfo schedule. Based on the interviews, the TravInfo organization is viewed at having been effective in resolving these issues.

Data For Transportation Modeling In The Santa Monica Corridor

Dahlgren, Joy
1998

The City of Los Angeles and Caltrans would like a simulation testbed for testing alternate traffic management strategies in the Santa Monica corridor. This study assesses the data available for such a simulation and describes data needs, potential sources, and data preparation required. It presents a work plan and resource requirements for acquiring the necessary data. The Appendix analyzes the conditions under which a simulation testbed is worthwhile. This study supported another PATH project, Los Angeles Smart Corridor Simulation Feasibility Study (MOU 270), which analyzed candidate...

Steady State Conditions on Automated Highways

del Castillo, Jose M.
Lovell, David J.
Daganzo, Carlos F.
1995

This paper is concerned with technical investigations of traffic operations on automated highways. Estimates are made of the steady-state capacity of such freeways, paying particular attention to the effect of entry and exit maneuvers. The possibility of scheduling departing vehicles appropriately into platoons to minimize extraneous maneuvers is investigated. Characteristics of urban areas likely to be candidates for automated freeways are discussed, and some shortcomings of automated freeways, vis-à-vis conventional freeways, are pointed out. Finally, some areas of future research needs...

Experimental Studies on High Speed Vehicle Steering Control with Magnetic Marker Referencing System

Tan, Han-Shue
Bougler, Bndicte
2000

This project is a one-and-half year research and experimental effort that builds on the results of as well as supplements the efforts in MOU 250, "Experimental Studies on Vehicle Control Systems." It focuses on an emerging issue of the high-speed steering control: how to conduct robust automatic vehicle steering control at highway speed based on a look-down lateral sensing system.

Summary of Selected, Significant ITS and ITS-related Policies and Programs in Europe and the US (with Japan Supplement)

Conroy, Pat
Ygnace, Jean-Luc
2002

This research project explored institutional and organizational factors contributing to successful deployment of Intelligent Transportation Systems (ITS). The researchers conducted a comprehensive internet/literature search on the status of ITS programs in Europe and the U.S., interviewed principals involved in ITS deployment both at the policy and project levels, and from the public and private sectors, and developed four case studies of successful ITS deployment. Results from the internet/literature search and responses from the survey/interviews were analyzed to identify critical...

Decision Support Systems for Managing and Applying ITS Resarch

Dahlgren, Joy
Al Kadri, Mohamed
Picado, Rosella
1998

This study is presented in three related papers. The first develops a structurefor making decisions regarding Caltrans/PATH research. It describes aresearch cycle in which real world needs and opportunities fed into a processby which research priorities are set, proposals invited, and projects areselected. These research projects ultimately provide information that can beused for further research or for implementation. Implementation changessociety and technology and leads to new needs and opportunities, which inturn feed into the research process. The second paper develops and...

Users’ Guide and Design Description SmartPath Simulator - Version MOU62

Hongola, Bruce
Tsao, Jacob
Hall, Randolph
1993

This document contains the user instructions and software design description for Version MOU62 of the SmartPath Simulator. The baseline version of the simulator including user instructions is described in [l].

Impacts of Computer-Mediated Communication on Travel and Communication Patterns: The Davis Community Network Study

Balepur, Prashant Narayan
1998

This report examines the interactions among different forms of communication, where travel is also considered a form of communication. Data for this study comes from 148 respondents to the "Activity Diary" survey instrument of the Davis Community Network (DCN) project, which obtained information on 636 uses of DCN. Generation, elimination and modification were considered to be the three major potential results of the present DCN communication and the five major types of communication considered were: in-person, physical object, electronic, in-person with travel, and physical object with...