PATH

Evaluation of Incorporating Hybrid Vehicle Use of HOV Lanes

Brownstone, David
Chu, Lianyu
Golob, Tom
Nesamani, K.S.
Recker, Will
2008

This report presents a method to investigate the operational and environmental effects of the policy of allowing qualified single-occupancy hybrid vehicles to use dedicated High-Occupancy Vehicle (HOV)/carpool lanes in California.. The method combines the traditional planning method with microscopic simulation modeling. The planning method is used for demand estimation and analysis and the microscopic traffic simulation modeling method is used for accurate measures of the system. The study employs a microscopic traffic simulation model that is capable of evaluating the HOV/hybrid system...

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...

Evaluating System ATMIS Technologies Via Rapid Estimation Of Network Flows: Final Report

Moore, II, James E.
Kim, Geunyoung
Cho, Seongdil
Hu, Hsi-hwa
Xu, Rong
1997

This report studies how flows in large scale transportation networks can be subjected to rapid estimation. It describes an efficient transportation network analysis (TNA) procedure that provides the system-wide changes of network flows under numerous scenario earthquakes. The first objective of this research is to provide reliable estimates of network flows with respect to changes in transportation networks, and to incorporate these changes to the decision-making procedures used by the California Department of Transportation (Caltrans) in making bridge retrofit decisions. The second...

Intelligent Sensor Validation And Sensor Fusion For Reliability And Safety Enhancement In Vehicle Control

Agogino, Alice
Goebel, Kai
Alag, Sanam
1995

This research project is concerned with sensor validation and sensor fusion as part of a five module hierarchical architecture for supervisory control. The goal is to enhance reliability and safety of the Intelligent Vehicle Highway System (IVHS) by taking into consideration the uncertainty of sensors and the system. Potential hazards are detected and feasible maneuvers are recommended within the upper modules of the architecture.

Considering Risk-Taking Behavior in Travel Time Reliability

Recker, Will
Chung, Younshik
Park, Jiyoung
Wang, Lesley
Chen, Anthony
Ji, Zhaowang
Liu, Henry
Horrocks, Matthew
Oh, Jun-Seok
2005

Travel time variability is increasingly being recognized as a major factor influencing travel decisions and, consequently, as an important performance measure in transportation management. In this research project, we examine a number of questions related to travel time variability: How should travel time variability be quantified at both the section level as well as at the route level?; How do travelers value travel time and its reliability?; How much does the travel time reliability contribute to travelers' route choices?; How much variation is there in travelers' preferences regarding...

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...

Vehicle Lateral Control Under Fault in Front and/or Rear Sensors

Lu, Guang
Huang, Jihua
Tomizuka, Masayoshi
2003

This report documents the findings of research performed under TO4204, "Vehicle Lateral Control under Fault in Front and/or Rear Sensors" during the year 2000- 2001. The research goal of TO4204 is to develop vehicle lateral control strategies under faulty operation of the magnetometers. The main objectives of the project are: (1) to design controllers that use the output from only one set of magnetometers, and (2) to develop an autonomous lateral control scheme that uses no magnetometers. New controllers that use just the front magnetometers have been designed based on H1 optimal design...

Toward Deployment of Adaptive Transit Signal Priority Systems

Li, Meng
Zhou, Kun
Yin, Yafeng
Tan, Chin-Woo
Zhang, Wei-Bin
Sun, Sonja
Leung, Kai
Lau, James
2008

This document reports the continuous efforts conducted by California PATH Program on the development and implementation of an Adaptive Transit Signal Priority (ATSP) system. The ATSP system has three distinguished features, including: (1) providing priority to transit vehicles while making a tradeoff between bus delay savings and the impacts on the rest of the traffic, (2) utilizing existing AVL/communication system already instrumented on buses to continuously monitor bus locations and predict bus arrival times to intersections and to request signal priority, and (3) building upon closed-...

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...

Driver/Pedestrian Behavior at Marked and Unmarked Crosswalks in the Tahoe Basin

Mitman, Meghan Fehlig
Cooper, Douglas
DuBose, Brooke
Pande, Swati
2010

For more than thirty years, pedestrian safety studies have considered pedestrian-vehicle collision history and pedestrian and driver behavior at marked and unmarked crosswalks at uncontrolled crossings. From 2005-2007, the UC Berkeley Traffic Safety Center, in a study funded by the California Department of Transportation (Caltrans), focused on developing a better understanding of driver and pedestrian behavior and safety in both marked and unmarked crosswalks in an effort to recommend more informed crosswalk policies. As a part of these efforts, a 2007 paper, “The Marked Crosswalk Dilemma...