PATH

Fault Detection and Handling for Longitudinal Control

Yi, Jingang
Howell, Adam
Horowitz, Roberto
Hedrick, Karl
Alvarez, Luis
2001

The purpose of this project is to extend and integrate existing results on fault diagnostics and fault management for passenger vehicles used in automated highway systems (AHS). These re-sults have been combined to form a fault diagnostic and management system for the longitudinal control system of the automated vehicles which has a heirarchical framework that complements the established PATH control system. Furthermore, the fault diagnostic module effectively mon-itors all of the sensors and actuators required for longitudinal control, while the fault handling module corrects for any...

The Naturalistic Driver Model: A Review of Distraction, Impairment and Emergency Factors

Caird, J.K.
Lees, M.
Edwards, C.
2005

The purpose of this project is to review the literature on driver distraction, impairment and emergency response that supports the development of the Naturalistic Driver Model. Driver models that are based on high-quality empirical research are more likely to serve as a useful and valid tool to professionals and researchers.

Estimating Pedestrian Accident Exposure

Greene-Roesel, Ryan
Diogenes, Mara Chagas
Ragland, David D.
2010

We are pleased to present the final report of Caltrans Task Orders 5211 and 6211, “Estimating Pedestrian Accident Exposure.” The project focused on defining pedestrian exposure and evaluating methods for measuring it within the State of California. The project was funded by the California Department of Transportation as part of the California Partners for Advanced Transit and Highways (PATH) Program of the University of California.Deliverables associated with the project include (I) a protocol report on assessing pedestrian exposure, which is accompanied by a training curriculum and an...

Evaluation Of The Transit Information System In Southern California

Le Colletter, Emmanuel
Yim, Youngbin
Hall, Randolph
1993

This report presents a study of the effectiveness of the transit telephone information system on trip behavior at Metropolitan Transit Authority ( MTA), from both the user's and the operator's perspective. The objectives of the experiment were: 1) to assess the perception of dynamic transit information service, 2) to identify the media which can most effectively disseminate transit information, and 3) to compare the information service by human operators with the service by an automated system. The study looks at both the supply and the demand side of the provision of telephone information...

A Decision-Oriented Framework for Evaluating Deployment Strategies for Intelligent Transportation Systems

Tsao, Jacob H.-S.
1999

Because Intelligent Transportation Systems (ITS) R&D is performed for the ultimate deployment in the real world, deployment issues may limit design options for ITS concepts and technologies and, hence, can be viewed as constraints on ITS R&D. Therefore, ITS deployment issues must be studied at the outset of the R&D process. This paper develops a framework to help recognize and organize such issues. The findings can be used by ITS researchers in developing deployable ITS concepts and technologies and by ITS promoters in deploying ITS technologies having been...

Commercial Motor Vehicles' Safety - A California Perspective

Giuliano, Gen
Zhou, Jiangping
McFerrin, Peter
Miller, Mark A.
2010

This report presents the findings of an examination of commercial motor vehicle crashes in California. Initially, a review of the basic descriptive statistics associated with truck-involved crashes in California was conducted; it covered the time period between January 1995 and December 2004 based on the Statewide Incident Tracking and Reporting System (SWITRS) data base, which contains information about every single motor vehicle accident in the state reported to a law enforcement agency. In addition to examinations of the entire population of truck-involved crashes in the state over the...

Cooperative Adaptive Cruise Control: Testing Drivers’ Choices of Following Distances

Nowakowski, Christopher
Shladover, Steven E.
Cody, Delphine
Bu, Fanping
O’Connell, Jessica
Spring, John
Dickey, Susan
Nelson, David
2010

A Cooperative Adaptive Cruise Control (CACC) system has been developed by adding a wireless vehicle-vehicle communication system and new control logic to an existing commercially available adaptive cruise control (ACC) system. The CACC is intended to enhance the vehicle-following capabilities of ACC so that drivers will be comfortable using it at shorter vehicle-following gaps than ACC. This can offer a significant opportunity to increase traffic flow density and efficiency without compromising safety or expanding roadway infrastructure.This report describes the design and implementation...

Low Speed Collision Dynamics: Second Year Report

Tongue, Benson
Moon, Ahrie
Harriman, Doug
1996

The goal of this project is to develop a user-friendly simulation program which will allow the study of platoon dynamics in both nominal and emergency scenarios. The report discusses the issues investigated during the second phase of the project, including the inclusion of a vehicle model with an engine model, transmission model, a combined lateral and longitudinal controller, and a more detailed collision dynamics model. The overall simulation program includes individual modules that supply control input force, aerodynamic drag force, and road-tire interaction forces.

Evaluation of the Effects of Intelligent Cruise Control Vehicles in Mixed Traffic

Ioannou, Petros
2003

This is the final report for the project entitled "Evaluation of the Effects of Intelligent Cruise Control Vehicles in Mixed Traffic". The project was initially under MOU392 and switched to Task Order 4217 at the beginning of the 2nd year of the project. Due to this administrative change a final report was submitted to PATH for MOU392 covering all the tasks completed during the 1st year of the project. The two research tasks that were not completed under MOU392 became the main focus of Task Order 4217.

Dynamic All-Red Extension at Signalized Intersection: Probabilistic Modeling and Algorithm

Zhang, Liping
Zhou, Kun
Zhang, Wei-Bin
Misener, James A.
2011

Dynamic All-Red Extension (DARE) has recently attracted research interest as a non-traditional intersection collision avoidance method. We propose a probabilistic model to predict red light running (RLR) hazard for dynamic all-red extension system. The RLR hazard, quantified by a predicted encroachment time, has contributory factors including the speed, distance and car-following status of the violator and the empirical distribution of the entry time of conflict traffic. An offline data analysis procedure is developed to set the parameters for RLR hazard prediction. Online-wise, a two-...