PATH

Robust Lateral Control of Heavy Duty Vehicles

Tai, Meihua
Wang, Jeng-Yu
White, Ryan
Tomizuka, Masayoshi
2001

In this report, achievements under MOU385, robust lateral control of heavy vehicles for automated highway systems are presented. The purpose of this project are: to design new controllers or redesign existing controllers for lateral control of heavy vehicles to improve performance; to evaluate designed controllers by experiments and to study autonomous vehicle following control. Toward this goal, we have obtained three main results during year 2000-2001, which are presented in this report.

ATIS -- Alternative Revenue Approaches

Yim, Y. B.
2001

As part of a continuing research on Advanced Traveler Information Systems (ATIS), this report presents an institutional analysis of alternative approaches to sustaining publicly supported ATIS. The fifteen largest metropolitan regions in the US and the private sector efforts were investigated through a literature review and in-person and telephone interviews. The study goals were to investigate alternative revenue approaches to achieve a self sustaining ATIS, identify institutional barriers to achieving self-sustainability, and develop a framework of assumptions. Two public sector...

Traffic Management Systems Performance Measurement: Study Directions And Scope, Proposed Measures Of Effectiveness, And Proposed Action Priorities

Banks, James H.
Kelly, Gregory
1997

This report documents research focusing on: 1) analyzing performance measurements for California Department of Transportation (Caltrans) Transportation Management Centers (TMCs); 2) identifying and assessing the feasibility of data collection and management activities required to support TMC performance measurement; and, 3) recommending specific actions by Caltrans and the California PATH program that will facilitate performance measurement.

Commuters' Normal And Shift Decisions In Unexpected Congestion: Pre-trip Response To Advanced Traveler Information Systems

Khattak, Asad
Polydoropoulou, Amalia
Ben-akiva, Moshe
1996

This report presents a study whose objective is to explore how people deal with unexpected congestion during the pre-trip stage and how they might respond to Advanced Traveler Information Systems (ATIS). Travelers' route, departure time and mode selection decisions were investigated through a survey of San Francisco Bay Area automobile commuters. The effects of various factors are examined, such as sources of congestion information, trip characteristics, and route attributes. The pre-trip response to future ATIS technologies is explored through stated preferences.

New Hardware and Software Design of a Field-Deployable Real-Time Laser-Based Non-Intrusive Detection System for Measurement of True Travel Time on the Highway

Cheng, Harry H.
Shaw, Ben
Palen, Joe
Lin, Bin
Hu, Xudong
Chen, Bo
Parks, Jason
2001

A new version of a field-deployable real-time laser-based detection system has been developed using new techniques of electronics and optics. The laser-based non-intrusive detection system uses a laser line that is projected onto the ground as a probe. The reflected light is collected and focused into a photodiode array by an optical system. Vehicle presence is detected based on the absence of reflected laser light. By placing two identical laser/sensor pairs at a known distance apart, the speeds of both the front and rear of a vehicle are measured based on the times when each sensor is...

Lateral Control Of Front-wheel-steering Rubber-tire Vehicles

Peng, Huei
Tomizuka, Masayoshi
1990

In this paper, two models were developed to describe the lateral dynamics of a vehicle for different purposes. The lateral feedback and feedforward controllers are designed to satisfy the above objective based on a linearized model, which includes only the lateral and yaw motions. The performance of the controllers is evaluated on a complex model, which includes motions in all six directions (longitudinal, lateral, vertical, roll, pitch and yaw). It has been validated by numerical simulations that the responses of the complex model and the simplified model remain close to each other when...

A First Example Specification Of An Automated Freeway

Hitchcock, Anthony
1991

This paper presents a specification for an automated freeway in a fully formal manner. A series of safety analyses have been carried out on the specification. The objective of the program is to derive a technique of safety analysis for such systems. Readers are advised to consult " Methods for Analysis of IVHS Safety: Final Report of PATH MOU 19" by the author for background information to this report.

Commuters’ Normal and Shift Decisions in Unexpected Congestion: En Route Responses to Advanced Traveler Information Systems Volume 2

Polydoropoulou, A.
Ben-akiva, M.
Khattak, A.
Lauprete, G.
1996

Advanced Traveler Information Systems (ATIS) are being developed to provide travelers with real-time information about traffic conditions. To evaluate the benefits of ATIS products and services, questions concerning potential market, usage, and travel response must be addressed. This paper focuses on en-route travel response to ATIS. The main objective is to explore how travelers deal with unexpected congestion and how they might respond to qualitative, quantitative, prescriptive and predictive information. Data on travelers’ route switching decisions are obtained through a survey of...

Bay Area Simulation and Ramp Metering Study

Gardes, Yonnel
May, Adolf D.
Dahlgren, Joy
Skarbardonis, Alex
2002

This research project focuses on the investigation of a portion of the southbound morning peak I-680 freeway facility, between I-580 in Pleasanton and SR 237 in San Jose. The project provided an opportunity for testing the Paramics model capabilities to replicate freeway traffic conditions, and assess to what extend the existing model can simulate various operational strategies such as HOV lanes and ramp metering.

Section Related Measures of Traffic System Performance: Final Report

Ritchie, Stephen
Sun, Carlos
1998

This project describes a new set of advanced traffic surveillance techniques that are based on inductive vehicle waveforms and pattern recognition technology. Focus is on demonstrating and evaluating a new method for obtaining true selection related performance measures, such as section travel time and section density, for freeways. The report also discusses methods for the measurement of lane-by-lane traffic movement and specific origin/destination demands.