PATH

TravInfo Field Operational Test Evaluation: Information Service Providers Customer Survey

Yim, Youngbin
2000

This paper presents the findings of the customer study of Information Service Providers. TheInformation Service Provider customer study is part of the traveler response evaluation for theTravInfo Field Operational Test. Presently, three private partners of the TravInfo project deploytraffic Web sites using exclusively the TravInfo database. A survey of Web site users wasconducted over seven months from August 1998 – March 1999. A survey instrument wasincorporated into the Web site. The study addressed the usage of Web site information and thetravel behavior of Web site users. The key...

Effects of Traffic Density on Communication Requirements for Cooperative Intersection Collision Avoidance Systems (CICAS)

Shladover, Steven E.
2005

Intersection collisions are difficult to mitigate or eliminate by use of ITS technologies for a variety of reasons. These include the complexity of the driving environment and of the driver decision making process at intersections, but also the difficulty of accurately detecting the movements of all potentially conflicting vehicles. Prior research by Calspan-Veridian Engineering (now part of General Dynamics) (1) showed the near impossibility of detecting the relevant information using vehicle-mounted sensor systems. Current research under the IDS program is revealing the challenges...

Travinfo Field Operational Test Evaluation Plan

Hall, Randolph
Yim, Y. B.
Khattak, Asad
Miller, Mark
Weissenberger, Stein
1995

TravInfo is a Field Operational Test (FOT) sponsored by the U.S. Federal Highway Administration. The goal of the project is to implement a centralized traveler information center to collect, integrate, and broadly disseminate timely and accurate traveler information in the San Francisco Bay Area. This evaluation plan describes the scope, methods, and procedures to measure the effectiveness of the project. The TravInfo evaluation will contain four evaluation elements: institutional, technology, traveler response, and network performance.

Spectrum Needs For IVHS

Linnartz, Jean-paul M. G.
Walrand, Jean
1993

This report summarizes the need for (dedicated) radio spectrum for IVHS communication services. It concludes that, if efficient architectures can be developed, several MHz of spectrum will be needed for large-scale introduction of IVHS services. Compared to most other reported estimates of the spectrum requirements, this report gives a more detailed discussion of the relation between message volume (bit/sec), the required grade of service and spectral bandwidth (Hz).

Some Aspects of the Market for Broadcast Traffic Information

Malchow, Matthew
Kanafani, Adib
1999

In recent years, planners have looked toward traffic information systems as an immediate solution to the congestion on U.S. highways. ITS systems are low-cost relative to many alternatives, and simple implementation allows for quick results. Alongside these investments has been research investigating the use of information systems by drivers and the results to be expected. Many studies have shown that the primary source of information for drivers has been broadcast systems such as the radio (e.g. Yim et al., 1997). Additional research has addressed other media which are used to transmit...

Freeway Detector Data Analysis For Simulation Of The Santa Monica Freeway - Summary Report

Bloomberg, Loren D.
May, Adolf D.
1993

The objective of this study is to collect, organize, analyze, and summarize available detector data for the Santa Monica Freeway. The primary goal is to develop on/off ramp counts as input to a synthetic origin/destination model; mainline freeways counts are also needed. Strategies for synthesizing data from stations where current detector data are unavailable are also considered. This report is a revised version of UCB-ITS-PWP-93-1 (PATH Database record #4079)

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,...