Data

Survey on Status of Knowledge and Interest of Smartcard Fare Collection Systems Among US Transit Agencies

Iseki, Hiroyuki
Yoh, Allison C.
Taylor, Brian D.
2006

This study analyzes data collected from an on-line survey of U.S. transit agencies to (1) gauge current levels of interest in smart card technologies, (2) document the current status of smart card system adoption among transit agencies, the degree of planning and implementation, and levels of participation in interagency collaborations, and (3) examine factors common to agencies that have adopted smart card technology and those that have not.Reflecting significant diversity in their goals and objectives, operating environments, financial conditions, and clients served, transit agencies...

A Statewide Optimal Resource Allocation Tool Using Geographic Information Systems, Spatial Analysis, and Regression Methods

Goulias, Konstadinos G.
Golob, Thomas F.
Yoon, Seo Youn
2008

The overall objective of this project is to develop an optimal resource allocation tool for the entire state of California using Geographic Information Systems and widely available data sources. As this tool evolves it will be used to make investment decisions in transportation infrastructure while accounting for their spatial and social distribution of impacts. Tools of this type do not exist due to lack of suitable planning support tools, lack of efforts in assembling data and information from a variety of sources, and lack of coordination in assembling the data. Suitable planning...

PEDAMACS: Power Efficient and Delay Aware Medium Access Protocol for Sensor Networks

Coleri, Sinem
Varaiya, Pravin
2004

We consider a class of sensor networks with two special characteristics. First, the nodes periodically generate data for transfer to a distinguished node called the access point. Second, the nodes are (transmit) power and energy limited, but the access point, which communicates with the ‘outside world’, is not so limited. Such networks might be used for instance when a geographically distributed physical process, such as traffic on a freeway or at an urban street intersection, is periodically sensed for purposes of process control. We propose a medium access control scheme, called PEDAMACS...

Modeling And Control Design For A Computer Controlled Brake System

Raza, H.
Xu, Z.
Ioannou, P.
Yang, B.
1995

In this paper, the problem of modeling and control design of a computer controlled brake system is addressed. A nonlinear model for the brake system is developed by analyzing the input-output data obtained from the test bench. A controller for the brake system is designed by applying feedback linearization techniques along with intuitive modifications to meet the closed loop specifications.

Evaluation of Portable Automated Data Collection Technologies: Final Report

Bank, James H.
2008

Portable automated traffic data collection systems were evaluated by means of a series of field demonstrations. Systems demonstrated included (a) temporarily mounted microwave radar sensors intended to provide volume, speed, and/or length classification data for traffic census or various traffic studies; (b) similar sensors mounted on a semi-permanent basis and intended to serve as substitutes for loop detectors in traffic surveillance systems; and (c) low-mounted infrared sensors used for axle counting. The field demonstrations focused on the issues of sensor accuracy for all systems and...

Cooperative Adaptive Cruise Control (CACC) For Partially Automated Truck Platooning:Final Report

Tan, Yaolong
Kanellakopoulos, Ioannis
2002

The report describes the results of the project funded under MOU 314.The main result is the experimental implementation of various longitudinal control algorithms that were developed under MOU124 and MOU 240. In order to conduct these experiments, in collaboration with Professor Tomizuka’s group and PATH Personnel, we first outfitted a Class-8 tractor-trailer commercial heavy-duty vehicle on loan from Freightliner Corporation with the necessary sensors and actuators for fully automated operation. These sensors and actuators included the vehicle speed sensors, air-brake pressure sensors,...

Streamlining Connected Automated Vehicle Test Data Collection and Evaluation in the Hardware-in-the-Loop Environment

Fu, Zhe
Liu, Hao, PhD
Lu, Xiao-Yun, PhD
2020

Quality data collection, processing, and analysis are foundational to good research, policy making and regulation development. With the rapid development of Connected Automated Vehicles (CAV) technologies, it is urgent for both researchers and policy makers to obtain and evaluate good quality CAV data to better understand CAV impacts. CAV hardware-in-the-loop (HIL) tests can expedite CAV performance evaluation and system implementation. This research aims at equipping an existing HIL test tool with data management functions. To this end, a database instance on MySQL has been integrated...

Tools for Operations Planning (TOPL2)

Varaiya, Pravin
2009

TOPL is a suite of tools to specify operational improvements including ramp metering, incident and demand management, auxiliary lanes, traveler information, and to quickly estimate the benefits that such improvements can realize. TOPL is based on the macroscopic cell transmission model (CTM). Advances under TOPL2 can be classified under (1) theory, (2) software and algorithms, and (3) applications.In terms of theory, the CTM model for a freeway was thoroughly analyzed and extended to arterials. In software, the major advance was the development of Aurora—an object-oriented simulation...

Optimal Use of Changeable Message Signs for Displaying Travel Times

Ban, Xuegang (Jeff)
Li, Yuwei
Margulici, Jean-Davi
2009

The report describes the research performed and the findings of the PATH Task Order 6303 “Optimal Use of Changeable Message Signs for Displaying Travel Times”. First, travel time estimation methods from various sources are evaluated against probe vehicle data. Next, a survey of San Francisco Bay Area commuters was undertaken regarding the perception and preference for displaying travel times on CMS. Finally, a model that evaluates the CMS impacts on network traffic and determines optimal CMS configurations was developed and tested. Deployment guidelines for CMS are presented based on these...

Planning the Development of a Commercial Motor Vehicle Virtual Weigh Station Technology Testbed

Miller, Mark A.
Sharafsaleh, Ashkan
2010

This report describes the issues associated with planning the development of a technology testbed for Virtual Weigh Stations in California. These issues may be organized into the following categories: system design and architecture, operational environment, siting & location, data collection, functional requirements and options, technology requirements and options, identification  of  stakeholders,  operational  testing  and  evaluation  (operational  scenarios,  performance measures, benefits &amp...