Data

Final Report: Mobile Surveillance and Wireless Communication Systems Field Operational Test Volume 3: Appendices A-J Containing Evaluation Data Gathered During the Anaheim Special Event and I-5 Tests

Klein, Lawrence
1999

The Mobile Surveillance and Wireless Communication Systems Field Operational Test(FOT) contained two evaluation tests, the Anaheim Special Event Test and theInterstate-5 (I-5) Test. The Anaheim Special Event Test assessed the ability of thesurveillance trailers to transmit video imagery to a traffic management center in supportof arterial traffic signal control. This test occurred during the Spring of 1997 inconjunction with heavy traffic experienced during hockey playoff games at theArrowhead Pond in Anaheim, CA. The I-5 Test evaluated the ability of the mobilesurveillance and ramp meter...

Evaluation Of The Freeway Service Patrol ( F S P ) In Los Angeles

Skabardonis, Alexander
Petty, Karl
Varaiya, Pravin
Bertini, Robert
1998

This report presents the results of a study designed to evaluate the effectiveness of the freeway service patrols (FSP) on a section of I-10 in Los Angeles. An evaluation methodology was used to estimate incident delays based on loop detector data and probe vehicles, and derive estimates of savings in performance measures in the absence of data for before FSP conditions. The estimated benefit cost ratios based on delay and fuel savings for a range of typical reductions in incident durations indicate that FSP produces significant benefits at the test site. Additional benefits include...

Freeway Service Patrol Evaluation

Skabardonis, Alexander
Noeimi, Hisham
Petty, Karl
Rydzewski, Dan
Varaiya, Pravin
Al-deek, Haitham
1995

This report presents the findings of a comprehensive evaluation of the freeway service patrol (FSP) program on specific freeway section in the San Francisco Bay Area. The study methodology consisted of determining the savings in incident delay and other performance measures "before" and " after" the implementation of FSP based on field data and improved analysis procedures. Data were collected during the peak periods on a mile section of the I-880 freeway in the City of Hayward, Alameda County. Software was developed to process the field data and create a computerized database. Benefits of...

Freeway Analysis Manual: Parts 1 and 2

May, Dolf
Leiman, Lannon
2005

This Freeway Analysis Manual is intended for those who are responsible for understanding, analyzing, and evaluating the operations of freeways for planning, design, and operational improvements of such facilities. Freeway analysis requires a creative person, knowledgeable in freeway analysis fundamentals, having good traffic data, and selecting appropriate analytical tools.

Un Enfoque para la Integración de Dispositivos IoT en el Desarrollo de SIG en la Nube

Rodriguez, D
Rodríguez, J
Zúñiga, M
Solano, L
2017

Cloud computing and Internet of Things (IoT) as technological support to the construction of Geographic Information Systems (GIS) is changing the way these systems are developed and employed. The technological infrastructure provided by cloud providers and used as deployment platform enables GIS to take advantage of its storage and processing capabilities, whereas using IoT devices automate the data collection process. However, current implementations of GIS, whose services are used on cloud environments and interact with IoT devices, are realized in an ad hoc manner, without...

Longitudinal Associations between the Neighborhood Built Environment and Cognition in US Older Adults: The Multi-Ethnic Study of Atherosclerosis

Besser, L
Chang, L
Hirsch, J
Rodriguez, D
Renne, J
Rapp, S
Fitzpatrick, A
Heckbert, S
Kaufman, J
Hughes, T
2021
Few studies have examined associations between neighborhood built environments (BE) and longitudinally measured cognition. We examined whether four BE characteristics were associated with six-year change in global cognition and processing speed. We obtained data on 1816 participants without dementia from the Multi-Ethnic Study of Atherosclerosis. BE measures included social destination density, walking destination density, proportion of land dedicated to retail, and network ratio (street connectivity). Global cognition was measured with the Cognitive Abilities Screening Instrument (CASI) and...

Public Transit Use in the United States in the Era of COVID-19: Transit Riders’ Travel Behavior in the COVID-19 Impact and Recovery Period

Parker, M
Li
Bouzaghrane, M
Obeid, H
Hayes, D
Frick, K
Rodriguez, D
Sengupta, R
Walker, J
Chatman, D
2021
COVID-19 has upended travel across the world, disrupting commute patterns, mode choices, and public transit systems. In the United States, changes to transit service and reductions in passenger volume due to COVID-19 are lasting longer than originally anticipated. In this paper we examine the impacts of the COVID-19 pandemic on individual travel behavior across the United States. We analyze mobility data from...

Urban Scaling of Health Outcomes: a Scoping Review

McCulley, EM
Mullachery, PH
Ortigoza, AF
Rodríguez, DA
Roux, AV Diez
Bilal, U
2022

Urban scaling is a framework that describes how city-level characteristics scale with variations in city size. This scoping review mapped the existing evidence on the urban scaling of health outcomes to identify gaps and inform future research. Using a structured search strategy, we identified and reviewed a total of 102 studies, a majority set in high-income countries using diverse city definitions. We found several historical studies that examined the dynamic relationships between city size and mortality occurring during the nineteenth and early twentieth centuries. In more recent years...

Tracking the State and Behavior of People in Response to COVID-1 19 Through the Fusion of Multiple Longitudinal Data Streams

Bouzaghrane, M
Obeid, H
Hayes, D
Chen, M
Li, M
Parker, M
Rodriguez, D
Chatman, D
Frick, K
Sengupta, R
Walker, J
2022

The changing nature of the COVID-19 pandemic has highlighted the importance of comprehensively considering its impacts and considering changes over time. Most COVID-19 related research addresses narrowly focused research questions and is therefore limited in addressing the complexities created by the interrelated impacts of the pandemic. Such research generally makes use of only one of either 1) actively collected data such as surveys, or 2) passively collected data. While a few studies make use of both actively and passively collected data, only one other study collects it longitudinally...

Assessing Area Under the Curve as an Alternative to Latent Growth Curve Modeling for Repeated Measures Zero-Inflated Poisson Data: A Simulation Study

Rodriguez, Daniel
2023
Researchers interested in the assessment of substance use trajectories, and predictors of change, have several data analysis options. These include, among others, generalized estimating equations and latent growth curve modeling. One difficulty in the assessment of substance use, however, is the nature of the variables studied. Although counting instances of use (e.g., the number of cigarettes smoked per day) would seem to be the best option, such data present difficulties in that the distribution of these variables is not likely normal. Count variables often follow a Poisson distribution,...