PATH

Evaluation Of Potential Hybrid Electric Vehicle Applications: Vol. II

Gris, Arturo
1991

Identifies potentially promising market segments for electric and hybrid vehicle technologies; covers topics including energy and power requirements, battery and range extender, propulsion system, and air conditioning

Formal Specification And Verification Of The Entry And Exit Maneuvers

Sachs, S. R.
Varaiya, P.
1996

This report studies the technical deployment of an Automated Highway System (AHS), and specifically, the interface between an AHS and Urban Arteries (UA). The report focuses on four tasks: 1) specify physical arrangement, operational procedures for entry/exit, 2) conceptualize functions of transfer zone between the AHS and UA, 3) characterize interaction between AHS and UA, and, 4) propose ways of controlling the interaction.

An Investigation Of The Costs Of Roadway Traffic Congestion: A Preparatory Step For IVHSBenefit's Evaluation

Miller, Mark A.
Li, Kayin
1994

This report focuses on traffic congestion under current road conditions with the objective of developing a quantitative understanding of their costs. The work is intended to provide a foundation upon which to build later estimates of the benefits that could be attributable to the use of Intelligent Vehicle Highway Systems (IVHS) technologies. The report gives an overview of traffic congestion and summarizes the principal sources of research in the areas of quantifying the costs of congestion. It reviews this past work relative to the usage of data, methodological approaches used in the...

Evaluation Of ITS Technology For Bus Timed Transfers

Hall, Randolph
Dessouky, Maged
Nowroozi, Ali
Singh, A.
1997

This paper evaluates dispatching rules at timed transfer transit terminals. The evaluation focuses on total passenger delay and the number of passengers missing their connections. Analytical and simulation models are developed to evaluate the benefit of Intelligent Transportation Systems (ITS) applications. The authors conclude that the benefit of ITS for timed transfer alone does not justify the implementation of Global Positioning Systems (GPS) for bus tracking technology.

Tools for Operations Planning (TOPL2)

Varaiya, Pravin
2009

TOPL is a suite of tools to specify operational improvements including ramp metering, incident and demand management, auxiliary lanes, traveler information, and to quickly estimate the benefits that such improvements can realize. TOPL is based on the macroscopic cell transmission model (CTM). Advances under TOPL2 can be classified under (1) theory, (2) software and algorithms, and (3) applications.In terms of theory, the CTM model for a freeway was thoroughly analyzed and extended to arterials. In software, the major advance was the development of Aurora—an object-oriented simulation...

An Exploration Of The Market For Traffic Information

Chan, Shirley
Malchow, Matthew
Kanafani, Adib
1997

This report attempts to derive a more accurate economic model to describe the supply and cost mechanisms that influence the market for traffic information. It first gives a history of the traffic information market, its economies-of-scale, and its potential for future development.e history of current The report discusses recent developments of value-added-resellers, the differences that exist in the marketing of their products, and factors influencing their success . Suggestions are presented for commercial broadcast stations and public agencies in terms of maximizing the total benefits of...

Throttle And Brake Control Systems For Automatic Vehicle Following

Ioannou, P.
Xu, Z.
1994

In this paper, the authors present several throttle and brake control systems for automatic vehicle following. These control systems are designed and tested using a validated nonlinear vehicle model first and then actual vehicles. Each vehicle to be controlled is assumed to be equipped with sensors that, in addition to its own vehicle characteristics, provide measurements of the relative distance and relative speed between itself and the vehicle in front. Vehicle-to- vehicle communication required for the stability of the dynamics of a platoon of vehicles with desired constant intervehicle...

Command Modification Using Input Shaping for Automated Highway Systems with Heavy Trucks

Bae, Hong S.
Gerdes, J. Christian
2004

Automated vehicles require sufficiently accurate system models in order to achieve a desired level of closed-loop performance in, for example, automated highways systems or smart cruise control systems. Parameters of the models are one of the important factors that determine the accuracy of system modeling and, eventually, the overall performance of the closed-loop system. Current GPS sensing technology enables estimation of road grade and, consequently, simple treatment of parameter estimation from a static force balance. This work has demonstrated that road grade can be reliably...

Safe Platooning In Automated Highway Systems

Alvarez, Luis
Horowitz, Roberto
1997

This report addresses the problem of designing safe controllers for the hybrid system composed by the interaction of the regulation and coordination layers in the hierarchical California PATH Automated Highway System (AHS) architecture. Conditions to achieve safe platooning under normal mode of operation are investigated. The results that are obtained allow for the decoupling of the design and verification of the regulation and coordination layers in the PATH AHS architecture.

Optimal Use of Changeable Message Signs for Displaying Travel Times

Ban, Xuegang (Jeff)
Li, Yuwei
Margulici, Jean-Davi
2009

The report describes the research performed and the findings of the PATH Task Order 6303 “Optimal Use of Changeable Message Signs for Displaying Travel Times”. First, travel time estimation methods from various sources are evaluated against probe vehicle data. Next, a survey of San Francisco Bay Area commuters was undertaken regarding the perception and preference for displaying travel times on CMS. Finally, a model that evaluates the CMS impacts on network traffic and determines optimal CMS configurations was developed and tested. Deployment guidelines for CMS are presented based on these...