PATH

Institutional Challenges to the Development and Deployment of ITS/ATS Systems in California

Horan, Thomas A.
Hempel, Lamont C.
Bowers, Margo
1995

This report provides an overview of the key institutional challenges that could affect the development and deployment of Intelligent Transportation Systems/Advanced Transportation Systems (ITWATS) technologies in California. The findings of the study are based on a series of in-depth interviews and review of research related to “non-technical” constraints both in California and at the national level. Based on this review, the study outlines three core areas that require attention: research collaboration--which focuses on public/private partnerships in the development of new technologies;...

Aggregation of Direct and Indirect Positioning Sensors for Vehicle Guidance

Agogino, Alice
Chao, Susan
Wang, Jiangxin
Deng, Xinyan
2000

Advanced Vehicle Control Systems (AVCS) require large numbers of sensors for different levels within the control hierarchy. Whereas all sensors contain uncertainty to some degree, different sensors are particularly useful for specific environmental conditions. Therefore, sensor redundancy is essential to achieving high sensor data fidelity for use in real-world, non-ideal, unpredictable environments. In this work, a positioning sensor system, which includes Global Positioning System (GPS) receivers, a radar sensor, and a linear transducer is investigated. Positioning sensors provide...

An Optimal Resource Allocation Tool for Urban Development Using GIS-based Accessibility Measures and Stochastic Frontier Analysis

Goulias, Konstadinos G.
2007

Assessments of transportation investment from a “social efficiency” viewpoint are absent from transportation policy analysis and marketing practice. This is mainly due to the lack of tools capable to assess the role of transportation infrastructure investment on the provision of activity opportunities to residents of each locality. In this report, we demonstrate a tool that identifies specific locations in an entire state where resource allocation has succeeded in maximizing benefits to the public. In addition, the tool and the Geographic Information System maps derived from this tool show...

ITS And The Environment: Issues And Recommendations For Its Deployment In California

Horan, T. A.
Hempel, L. C.
Jordan, D. R.
Alm, E. A.
1996

This study culminates a two year, multi-faceted inquiry into the environmental issues associated with Intelligent Transportation Systems ( ITS). In addition to reviewing the literature on ITS-related environmental issues, the report presents results from three focus groups that explored the attitudes of California environmental stakeholders about ITS. The report also addresses public acceptance issues related to ITS, focusing on public acceptance of Advanced Traveler Information Services (ATIS), congestion pricing, and telecommuting. The report concludes with summary results and...

A Parmetric Study of Platoon Dynamics and Robust H[infinity] Controller Design

Oh, Pahngroc
Packard, Andy
Tongue, Benson H.
1999

A comprehensive simulation capability is presented for the analysis of vehicular platoons with or without collisions. A separate collision module (CDM) is integrated within the Platoon Simulation Package (PSP) to allow the recognition and dynamic simulation of intra- platoon collisions. Test simulations are presented and an alternative control strategy, one based on H , optimization, is described. This control approach allows an explicit account to be taken unknown disturbances and system variations, i.e. it produces a robust design.

Field Operational Tests of Adaptive Transit Signal Priority Systems

Li, Meng
2010

An Adaptive Transit Signal Priority (ATSP) system is built upon and integrated with the existing Transit Automated Vehicle Location/Advanced communications system (AVL/ACS) to provide transit buses with needed priority by adaptively determining an optimum signal timing strategy based on status of both the concerned transit bus and the traffic conditions. PATH has conducted a series of studies on ATSP in collaboration with the California Department of Transportation (Caltrans) and San Mateo County Transit District (SamTrans) since 2000, involving the development and implementation of a...

Traffic Control For Automated Highway Systems: A Conceptual Framework

Tsao, Jacob
1995

This paper proposes a conceptual framework for designing a traffic control scheme. It adopts a top-down approach to defining major design steps starting with high-level feature definition. With the desired features defined, the top-down approach then identifies and defines moves and related planning and movement functions that are required for supporting the desired features. The paper takes a systems view and identifies the safety issues regarding the movement coordination of the large number of vehicles on an Automated Highway System (AHS).

A Communication Architecture For IVHS

Streisand, Susan L.
Walrand, Jean
1992

This paper documents the development of a communications architecture for Intelligent Vehicle Highway Systems (IVHS) being studied by the California PATH Program. The authors use a layered architecture based on the OSI 7- layer reference model.

Stage Definition For Ahs Deployment And An Ahs Evolutionary Scenario

Tsao, H. S. Jacob
1996

This paper proposes an approach to defining evolutionary scenarios for the deployment of an Automated Highway System (AHS). Six dimensions of deployment difficulties are identified: technology, infrastructure, human factors, vehicle manufacturing and maintenance, insurance, and public will.

Assessing the Value of TMCs and Methods to Evaluate the Long Term Effects of ITS Implementation: A General Equilibrium Approach

Gillen, David
2004

This research builds on the contributions of MOU 357, 3001 and task Order 4119 all of which focus on methodological and measurement issues in benefit cost assessments of ITS applications. The important contributions of this work are not only providing methods for calculating benefits and costs but also an empirical assessment of the set of projects that have been implemented. In all of this work, as well as most other project evaluation studies, two strong assumptions are made. First, the project is implemented successfully and second the impact of the transportation project is felt wholly...