PATH

Magnetometer/GPS/INS Demo 2002 Support and Mitigation of GPS Signal Blockage Research

Farrell, Jay
2004

This project is concerned with accurately and reliably determining the state of a vehicle relative to a specified trajectory (e.g., a lane centerline). We are utilizing inertial navigation methods based on inexpensive solid state inertial sensors aided by external sensors such as carrier phase differential GPS, magnetometers, and roadway height. Due to this integration of sensors, reliability is increased relative to a single sensor approach and the changes required to the roadway infrastructure may be significantly decreased. This projects objectives included preparation for and...

Deliver a Set of Tools for Resolving Bad Inductive Loops and Correcting Bad Data

Lu, Xiao-Yun
Kim, ZuWhan
Cao, Meng
Varaiya, Pravin
Horowitz, Roberto
2010

This report documents a practical work conducted at California PATH for developing a portable tool to be used at the control cabinet level to accurately diagnose any fault(s) of a loop detection system (including loop circuits, loop cards, cable links, etc.), to check the detection accuracy, to deal with sensitivity of detector card, and to correct the faulty data. To achieve these functionalities at the low level, it is necessary to utilize an independent source as a baseline data to compare against the loop detection system output. Such a comparison also permits an evaluation of the loop...

Planits: A User's Guide For The Prototype

Cayford, Randall
Khattak, Asad
Kanafani, Adib
1995

This paper presents a simple prototype to demonstrate the key functions of PLANiTS (Planning and Analysis for Integration for Intelligent Transportation Systems). The prototype has a planning vector that allows users to enter and edit transportation actions, performance measures and environmental descriptors. This guide demonstrates how users specify each of these elements in terms of temporal, spatial and user dimensions and analyze the planning vector with models and case-based reasoning. During the process of planning vector specification and analysis, users at different locations can...

Highway Electrification And Automation Technologies - Regional Impacts Analysis Project: Phase III Appendices: Mobility Statistics

Scag
Path
1993

This report presents appendices to the third, and final, phase of the Highway Electrification and Automation Technologies Regional Impacts Analysis Project (HE&A). The focus of Phase III report is the assessment of regional impacts associated with application of roadway electrification, and automation technologies to selected freeway sections in the Southern California region.

Preparing the Way for Vehicle-Infrastructure Integration

Shladover, Steven E.
2005

Vehicle-Infrastructure Integration (VII) is one of the most important new national programs within the field of ITS, but until now it has been treated at the federal level as a deployment-oriented activity, without significant research elements. This report identifies some key research issues that need to be investigated in support of VII, in order to ensure that the VII concept and designs are as efficient and effective as possible and in order to produce the essential knowledge base that public agencies throughout the country can rely upon to make well-informed decisions about...

During the last decade considerable research and development efforts have been devoted to automating vehicles in an effort to improve safety and efficiency of vehicle following. While dedicated highways with fully automated vehicles is a far in the future

Bose, Arnab
Ioannou, Petros
1999

During the last decade considerable research and development efforts have been devoted to automating vehicles in an effort to improve safety and efficiency of vehicle following. While dedicated highways with fully automated vehicles is a far in the future objective, the introduction of semi-automated vehicles on current highways designed to operate with manually driven vehicles is a realistic near term objective. The purpose of this paper is to analyze the effects on traffic flow characteristics and environment when semi-automated vehicles with automatic vehicle following capability (in...

Highway Electrification And Automation Technologies - Regional Impacts Analysis Project: Phase III Appendices: Mobility Statistics

Scag
Path
1993

This report presents appendices to the third, and final, phase of the Highway Electrification and Automation Technologies Regional Impacts Analysis Project (HE&A). The focus of Phase III report is the assessment of regional impacts associated with application of roadway electrification, and automation technologies to selected freeway sections in the Southern California region.

Freeway Service Patrol (fsp) 1.1: The Analysis Software For The Fsp Project

Petty, Karl
1995

This document is a reference manual for the fsp and xfsp programs. The fsp program is a software tool used to interrogate the data that was collected during the Freeway Service Patrol Evaluation Project. The purpose of the program is to perform diagnostics on the data, generate error reports, and make plots of various pieces of data. The xfsp program is a graphical user interface to the fsp program. It allows the user to create the runfile and the incident filter that the fsp proram requires by pointing and clicking on various butons and widgets with the mouse.

Trajectory Design And Implementation Of Longitudinal Maneuvers On AHS Automated And Transition Lanes

Chen, Pin-yen
Alvarez, Luis
Horowitz, Roberto
1997

In this report, the authors present a modified safe join trajectory for the regulation layer maneuvers of the hierarchical PATH Automated Highway System (AHS) architecture. This new design presents a more conservative behavior for the controlled platoon in a maneuver. The new trajectory reduces the chance of having a collision when the platoon ahead applies and holds maximum braking.

Lane Assist Systems for Bus Rapid Transit, Volume I: Technology Assessment

Shladover, Steven E.
Zhang, Wei-Bin
Jamison, Doug
Carey, Graham
Viggiano, Stefano
Angelillo, David
Cunradi, Jim
Sheehan, Brian
Schumacher, Dave
Oropeza, Maurilio
Hardy, Matthew
Kulyk, Walter
Gross, Yehuda
2007

This report documents the information collected by an FTA-led delegation to several European organizations that have had experience in the development and operation of transit lane assist systems based on three different technologies, including (1) optical guidance in Rouen, France, (2) magnetic guidance in Eindhoven, Netherlands and (3) mechanical guidance in Essen, Germany. It includes summaries of the briefings prepared by the European hosts in response to questions from the delegation, the discussions the delegation had with their hosts and observations based on riding the systems in...