PATH

Notes From a Talk on Standards and IVHS Safety

Hitchcock, Anthony
1991

This paper records a personal understanding of some features of the needs for standards and codes of practice in IVHS, and of the present position regarding them, in so far as the author has:a. perceived them to be relevant to his own studies in the AVCS field in the U.S., mainly in relation to full automation.b. been able to obtain access to the appropriate documents; he does not have easy access to a library containing defense standards.

Studies of Vehicle Collisions - A Documentation of the Simulation Codes: SMAC (Simulation Model of Automobile Collisions) [ Diskette Included ]

Chan, Ching-Yao
1998

This document describes part of the work conducted under MOU252 and MOU324, related to the studies of vehicle collisions in vehicle-following operations. This working paper is a detailed documentation of a computer program that is the core element of the simulation tools for vehicle collision dynamics. The program, SMAC (Simulation Model of Automobile Collisions), and its PC-platform version EDSMAC have been used extensively in recent work at PATH to investigate the consequences of vehicle collisions and the effects of vehicle-following parameters on collisions. A copy of the source codes...

Advanced Simulation Tools for Freeway Corridor Management

Gardes, Yonnel;
Tang, Eric
Ma, Jingtao
May, Adolf D.
2003

As part of the California PATH program, the Paramics microscopic traffic simulation model was applied to the I-580 freeway-arterial corridor. The main purposes of the project were two-fold:- Develop the expertise and transfer the knowledge required in calibrating a large-scale freeway corridor with Paramics;- Prepare a calibrated model for the I-580 corridor that could be used to address operational questions, evaluate potential improvement alternatives and provide input to the decision-making process.In agreement with Caltrans District 4 and Headquarters, the study focused on the...

Paramics API Development Document for Actuated Signal, Signal Coordination and Ramp Control

Liu, Henry X.
Chu, Lianyu
Recker, Will
2001

Paramics is a suite of high performance software tools used to model the movement and behavior of individual vehicles on urban and highway road networks. The Paramics Project Suite consists of Modeller, Processor, Analyzer, and Programmer. Paramics Programmer is a framework that allows the user to customize many features of underlying simulation model. Access is provided through a Functional Interface or Application Programming Interface (API). The capability to access and modify the underlying simulation model through API is essential for research. Such an API should have a dual role,...

Traveler Response to Innovative Personalized Demand-Responsive Transit in the San Francisco Bay Area

Khattak, Asad J.
Yim, Youngbin
2003

Urban sprawl makes conventional transit less competitive and points to the need for more innovative and flexible demand-responsive transit systems in the future. To increase their efficiency, such systems can take advantage of the emerging advanced public transportation systems technologies, e.g., vehicle location and information systems. However, little is known about how consumers might respond to such systems and what they desire. This paper explores the demand for a consumer-oriented Personalized Demand Responsive Transit (PDRT) service in the San Francisco Bay Area. Such a system...

Video-Based Vehicle Signature Analysis and Tracking Phase 1: Verification of Concept Preliminary Testing

MacCarley, Arthur C.
1998

This report describes the results of the PATH/Caltrans-funded project Video-Base Signature Analysis and Tracking (VSAT) System, Phase 1: Verification of Concept and Preliminary Testing. The VSAT System was conceived in 1995 by Loragen Systems, of Glendale, California, as a means for non-intrusively tracking individual vehicles on freeways for data collection purposes. The concept involves the use of a computer vision methods to make simple measurements of external dimensions, points of optical demarcation, and predominant colors of each vehicle. A conventional color video camera serves as...

Estimation of Truck Traffic Volume from Single Loop Detectors Using Lane-to-Lane Speed Correlation

Kwon, Jaimyoung
Varaiya, Pravin
Skabardonis, Alexander
2003

An algorithm for real time estimation of truck traffic in multi-lane freeway is proposed. The algorithm uses data from single loop detectors-the most widely installed surveillance technology for urban freeways in the US. The algorithm works for those freeway locations that have a truck-free lane, and exhibit high lane-to-lane speed correlation. These conditions are met by most urban freeway locations. The algorithm produces real time estimates of the truck traffic volumes at the location. It can also be used to produce alternative estimate of the mean effective vehicle length, which can...

Investigating Institutional Aspects of Multi-Agency Transit Operations-Review of the Literature

Lam, Amy
Miller, Mark A.
2002

Transit systems have traditionally been developed independently from one another,certainly across different regional jurisdictional boundaries,however,even within the same regional jurisdictional boundary where the ramifications of this are most significantly felt.Little attention has been given to coordination,integration,or interoperability between and among systems.As a result,customer satisfaction,market share and public transit relevance has continued to decline. This report,which presents the findings from our literature review of the topic of multi-agency transit operations,...

Integrated Smart Feeder / Shuttle Bus Service

Ceder, Avishai
Yim, Youngbin
2003

This paper presents the design of an integrated smart feeder/shuttle system. The design of such a system was motivated by the need to provide easy access to main haul transit services. Park and ride lots in many train stations can no longer accommodate automobiles brought to the stations. Some train riders have switched their mode of transportation from public transit to solo driving. Shortage of parking spaces at rail stations encourages passengers to drive alone, hence more cars on freeways and worsening traffic congestion. The purpose of this study is to design an innovative feeder/...

Assessment of Service Integration Practices for Public Transportation: Review of the Literature

Miller, Mark A.
2004

This report documents a review of the literature of transit service integration policies. It is the initial task of a project whose objective is to understand service integration policies and practices that transit agencies have employed and the benefits such policies have brought. Studies have shown that ongoing coordination and integration of transit services can improve public transportation system connectivity and reliability, and help make transit a more attractive travel mode alternative to the car. Findings from the literature shed light on several topics, including how service...