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Vehicle Following Control Design for Automated Highway Systems

Raza, H.
Ioannou, P.
1997

Automatic vehicle following is an important feature of a fully or partially automated highway system (AHS). The on-board vehicle control system should be able to accept and process inputs from the driver, the infrastructure and other vehicles, perform diagnostics and provide the appropriate commands to actuators so that the resulting motion of the vehicle is safe and compatible with the AHS objectives. The purpose of this paper is to design and test a vehicle control system in order to achieve full vehicle automation in the longitudinal direction for several modes of operation, where the...

Advanced Braking Methods for Longitudinal Control of Commercial Heavy Vehicles

Moklegaard, Lasse
Stefanopoulou, Anna G.
2000

In this report, we develop nonlinear dynamical models and longitudinal control algorithms that coordinate variable compression brake mechanism with service brakes for a Class-8 commercial heavy vehicle. For the coordination and full use of these retarding actuators, we model the multivariable system based on physics-based principles and experimental data. We show that, for one specific critical braking maneuver, the coordination of compression and service brakes reduces the use of the service brakes by a factor of 45, and that it reduces the settling time by a factor of 2. Key words:...

Constraints on Initial AHS Deployment and the Concept Definition of a Shuttle Service for AHS Debut

Tsao, H. S. Jacob
1996

This paper proposes a shuttle van service as the initial deployment Automated Highway System (AHS) target. The freeway portion of the trip is fully automated and a professional driver is required for off-freeway driving. Advantages from the viewpoint of of different deployment issues are discussed. Focus is on the concept definition.

Evaluation of PeMS to Improve the Congestion Monitoring Program

Kwon, Jaimyoung
McCullough, Bill
Petty, Karl
Varaiya, Pravin
2007

The highway congestion monitoring program (HICOMP) report is based on data from tach vehicle runs or PeMS. Research under TO 5319 compares the accuracy and cost of these two alternatives. The detailed studies described in the report lead to the following conclusions and suggestions for follow-on work:1. In freeway sections with good quality detectors spaced at most one-half mile apart, PeMS-based estimates of the magnitude, extent and duration of congestion are incomparably more accurate than those based on tach vehicle runs.2. Because at most four days of tach run data are used to...

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.

TravInfo Evaluation: Institutional Element Phase 1 Results

Hall, Randolph
Yim, Y. B.
Pfeifle, Brian
Weissenberger, Stein
1995

The TravInfo project aims to develop a multi-modal traveler information system for the San Francisco Bay Area, developing a partnership between the public and private sectors. This report presents the results of the first wave of institutional interviews, as part of the TravInfo evaluation.

TravInfo Evaluation Plan

Yim, Youngbin
Khattak, Asad
Miller, Mark
Hall, Randolf
1993

This document presents an evaluation plan for the TravInfo project, a field operational test of a centralized database in the San Francisco Bay Area. The TravInfo Evaluation Plan is prepared in accordance with the Mitre guidelines adopted by the Federal Highway Administration (FHWA) for IVHS Operational Test Evaluation Plans. The report consists of five major sections: introduction, traveler response component, institutional component, technology assessment, and system evaluation.

Travel, Emissions, and Consumer Benefits of Advanced Transit Technologies in the Sacramento Region

Johnston, R.
Rodier, C.
1996

The purpose of this project was to examine the potential travel effects, emissions, and consumer welfare benefits of advanced transit technologies. These technologies included advanced transit information, demand responsive transit, and personal rapid transit. The Sacramento Regional Travel Demand model (SACMET 95) was used to simulate the travel effects. Consumer welfare evaluation was accomplished by applying the Small-Rosen model to SACMET. Five advanced transit scenarios for the Sacramento region in the year 2015 were examined. It was found that the advanced transit technologies, which...

TravInfo Evaluation (Technology Element) Traveler Information Center (TIC) Study: Operator Interface Component-Phase IV: Institutional Analysis

Miller, Mark
Loukakos, Dimitri
1998

TravInfo is a Field Operational Test of advanced traveler information systems for the San Francisco Bay Area, sponsored by the Federal Highway Administration (FHWA). The project involves a public/private partnership which seeks to compile, integrate and broadly disseminate timely and accurate multi-modal traveler information through commercial products and services. The public sector component centers on the Traveler Information Center (TIC), which collects and integrates both static and dynamic traveler information. The TIC began operations in September 1996 and operates as an FOT through...

Cal Poly Pomona EDAPTS Test Deployment

Jia, Xudong, PhD
Gerfen, Jeff, MS
Hockaday, Neil
Chapman, Bruce
2010

The Efficient Deployment of Advanced Public Transportation Systems (EDAPTS) demonstration at California State Polytechnic University, Pomona assessed the viability of using the EDAPTS procurement, installation, verification, and validation processes in a small transit environment to reduce the cost of ownership for technology solutions. Modified Systems Engineering processes were used to deploy an Intelligent Transportation System (ITS) solution on the Cal Poly Pomona Bronco Express campus bus system. This report provides a summary of methodologies used, outcomes, findings, recommendations...