PATH

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...

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...

Development of Binocular Stereopsis for Vehicle Lateral Control, Longitudinal Control and Obstacle Detection

Malik, Jitendra
Kosecka, Jana
Taylor, Camillo J.
McLauchlan, Philip
1999

This nal report describes the application of computer vision techniques to the lateral and longitudinal control of an autonomous highway vehicle. In the part of the project we focused on an analysis of the vehicle's lateral dynamics and the design of an appropriate controller for lateral control and investigated various static feedback strategies where the measurements obtained from vision, namely o set from the centerline and angle between the road tangent and the orientation of the vehicle at some look-ahead distance, are directly used for control. The role of the look-ahead, its...

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...

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.

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...

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.

Institutional Challenges to the Development and Deployment of ITS/ATS Systems in California

Horan, Thomas A.
Hempel, Lamont C.
Bowers, Margo
1995

This report provides an overview of the key institutional challenges that could affect the development and deployment of Intelligent Transportation Systems/Advanced Transportation Systems (ITWATS) technologies in California. The findings of the study are based on a series of in-depth interviews and review of research related to “non-technical” constraints both in California and at the national level. Based on this review, the study outlines three core areas that require attention: research collaboration--which focuses on public/private partnerships in the development of new technologies;...

Aggregation of Direct and Indirect Positioning Sensors for Vehicle Guidance

Agogino, Alice
Chao, Susan
Wang, Jiangxin
Deng, Xinyan
2000

Advanced Vehicle Control Systems (AVCS) require large numbers of sensors for different levels within the control hierarchy. Whereas all sensors contain uncertainty to some degree, different sensors are particularly useful for specific environmental conditions. Therefore, sensor redundancy is essential to achieving high sensor data fidelity for use in real-world, non-ideal, unpredictable environments. In this work, a positioning sensor system, which includes Global Positioning System (GPS) receivers, a radar sensor, and a linear transducer is investigated. Positioning sensors provide...