PATH

Fault Diagnosis and Safety Design of Automated Steering Controller and Electronic Control Unit (ECU) for Steering Actuator

Tan, Han-Shue
Bu, Fanping
Koo, Shiang-Lung
Zhang, Wei-Bin
2005

This final reports the fault analysis of precision docking system and safety design of the safety critical elements for precision docking system. The report includes three Parts, including:Part I provides a description of the Precision Docking System and reports analysis for fault diagnosis and safety design of automated steering controller and Electronic Control Unit (ECU) for steering actuator. It also reports a demonstration PATH conducted during the National Intelligent Vehicle Initiative demonstration organized by the US Department of Transportation Joint Program Office.Part II report...

Towards an Accessible City: Removing Functional Barriers to Independent Travel for Blind and Vision-Impaired Residents and Visitors

Golledge, Reginald G.
Marston, James R.
1999

This study examined the effect that use of Remote Infrared Signage Systems has on performance of blind or vision impaired people when undertaking a variety of bus user tasks, including finding a suburban bus stop, identifying a specific bus and boarding it, disembarking at the downtown terminal and finding the entrance, traversing the terminal and learning the location of facilities inside and simulating the exiting of a buss.

Evaluation of the OCTA Transit Probe System

Hall, Randolph W.
Vyas, Nilesh
Shyani, Chintan
Sabnani, Vikas
Khetani, Simit
1999

The OCTA (Orange County Transit Authority) Transit Probe Project is a field operational test of an automatic-vehicle-location (AVL) system operating in Orange County, California. This report presents the final evaluation results for the project, concentrating on the operational period from June 1, 1998 to May 30, 1999. The report provides a detailed description of the system and the motivation for its design. It provides analyses of data reliability and accuracy, and analysis of the usefulness of transit probe data for predicting automobile travel times. Institutional issues are evaluated...

An Efficient Lane Change Maneuver for Platoons of Vehicles in an Automated Highway System

Horowitz, Roberto
Tan, Chin-Woo
Sun, Xiaotian
2004

The current lane change maneuver for vehicles in a platoon under the California PATH automated highway system (AHS) architecture is inefficient, because the follower has to split from the rest of the platoon before making a lane change. In this report, we propose to add a lane change within platoons maneuver that allows a follower to change lanes and be inserted into another platoon directly without splitting either platoon. This maneuver is performed by aligning and locking the longitudinal positions of the two platoons in adjacent lanes. The estimated improvement in the AHS utilization,...

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test; Volume 1: Executive Summary

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test (FOT) evaluated the performance of wireless traffic detection and communications systems in areas where permanent detectors, electrical power, and landline communications were not available. The FOT partners designed and built six surveillance and three ramp meter trailers, a video and data retransmission or relay site, and video and data reception facilities at the Caltrans District 12 and Anaheim Traffic Management Center (TMCs) and the University of California at Irvine Institute of Transportation Studies...

Experimental Verification of Discretely Variable Compression Braking Control for Heavy Duty Vehicles: Final Report

Vahidi, Ardalan
Stefanopoulou, Anna G.
Wang, Xiaoyong
Tsao, Tsu Chin
2004

In the first two chapters of this report, the development of discrete compression brake and transmission models is explained. In the vehicle model development, special efforts have been put in transmission shifting scheduling. Transmission up-shift and down-shift scheduling are separated in the modelling. Hysteresis during shifting is introduced to reduce chattering. A compression brake effect on transmission shifting is identified and considered in the modelling. The new transmission shifting model has been validated through experimental data. The transmission shifting model is combined...

Assessing the Benefits and Costs of Intelligent Tranportation Systems: Ramp Meters

Kang, Seungmin
Gillen, David
1999

This study undertakes an evaluation of the benefits and costs of ramp metering. The primary purpose was to provide empirical information on the value of the introduction and use of this form of ITS technology. Three cases are examined in the analysis. The impact of ramp metering on traffic behavior is simulated based on a cell transmission model and an assumed travel demand on the freeway as well as the ramp. Temporal travel demand change is determined based on the average travel pattern obtained from the I-880 freeway database. Isolated, single traffic responsive ramp metering is assumed...

Study of Integrated Corridor Management for San Francisco Bay Area I-880 Corridor

Zhang, Wei-Bin
Li, Irene
Shladover, Steven
Li, Meng
Alm, Erik
Ban, Jeff
Victor, Radiah
Yee, Albert
Stanislaus, Danielle
Chow, Alan
Nozzari, Sean
Minoofar, Cyrus
Yarjani, Bijan
Spencer, Tina
Broadbent, Patricia
Alexiadis, Vassili
Hatata, Tarek
Nejad, Anush
Shamskhou, Habib
2008

This document summarizes the efforts by the San Francisco Bay Area ICM team to develop the concept of operation, data needs and performance requirements for an Integrated Corridor management System for I-880 Corridor. Although the transportation management systems at the Bay Area are consistent with the regional ITS plans, these management systems are less integrated. It is believed that higher lebel of intergration among freeway and arterial systems, transit systems with consideration of all transportation needs demands in the region will greatly enhance and improve the efficiency and...

Investigating Intelligent Transportation Systems Strategies On The Santa Monica Freeway Corridor: Technical Appendix

Bacon, Jr., V.
Windover, J.
May, A.
1995

This document contains the technical appendices to the report on Investigating Intelligent Transportation Systems Strategies on the Santa Monica Freeway Corridor (see PATH Database record no. 8800.)

Models of Vehicular Collision: Development and Simulation with Emphasis on Safety V: MEDUSA: Theory, Examples, User's Manual, Programmer's Guide and Code

O'Reilly, Oliver M.
Papadopoulos, Panayiotis
Lo, Gwo-Jeng
Varadi, Peter C.
1999

This document constitutes a final report for MOU 39. It contains a User's Manual, Programmer's Guide, source code and underlying theory for the program MEDUSA. This program is capable of simulating both the normative driving dynamics and collision dynamics of an arbitrary number of vehicles. Its range of validity lies in the assumed nature of the vehicular collision, and it is recommended for use in studying low relative velocity impact scenarios at large time-scales. Keywords: IVHS America, Vehicle Dynamics, Collision Dynamics, Safety, computer Simluation, Animal and Simulation; A...