Infrastructure

A Scaling Investigation of Urban Form Features in Latin America Cities

Paiva, SS
Santos, GF
Castro, CP
Rodriguez, DA
Bilal, U
Filho, F
Anderson, F
Montes, F
Dronova, I
Barreto, M
Andrade, R
2023

This paper examines scaling behaviors of urban landscape and street design metrics with respect to city population in Latin America. We used data from the SALURBAL project, which has compiled and harmonized data on health, social, and built environment for 371 Latin American cities above 100,000 inhabitants. These metrics included total urbanized area, effective mesh size, area in km2 and number of streets. We obtained scaling relations by regressing log(metric) on log (city population). The results show an overall sub-linear scaling behavior of most variables, indicating a...

Extracting More Information from the Existing Freeway Traffic Monitoring Infrastructure

Coifman, Benjamin
2006

This report presents the results of TO 5302, Extracting More Information from the Existing Freeway Traffic Monitoring Infrastructure. This report represents significant advances in the PATH sponsored research into vehicle reidentification from conventional loop detectors, first by extending the methodology across major merge and diverge freeway sections. Second, it extends the methodology to single loop detectors. The report also extends the understanding of traffic phenomena impacting both traffic flow and the performance of the reidentification algorithms. It examines the impacts of lane...

California System Architecture Study: Architecture for Action: A Strategy for Facilitating Near-term Deployment

Horan, Thomas A.
Glazer, Lawernce Jesse
Hoene, Christopher
Hall, Randolph
Intihar, Christopher
Ice, Ronald
1999

Intelligent Transportation Systems (ITS), ushered in by ISTEA in 1991 and advanced under TEA-21 in 1998, fundamentally alter transportation planning and implementation in the United States. ITS shifts emphasis away from new construction and capacity to more efficient management of existing systems, in the process requiring increased coordination and integration of standards, systems, and policies. The National ITS Architecture provides a framework for integration, but leaves the majority of the implementation decisions to the state, regional, and local levels. California is well-positioned...

Roadway Powered Electric Vehicle Project Track Construction And Testing Program Phase 3D

Systems Control Technology, Inc.
1994

This report covers the construction and testing of a Roadway Powered Electric Vehicle (RPEV) proof-of-concept system. The test facility was built at the University of California Richmond Field Station. The facility has a 700-foot test track and an operational 35-passenger RPEV. The report contains an introduction to the concept of RPEV and discusses the following aspects of the project: systems engineering and design, vehicle, facilities, testing, related RPEV research, and control circuits.

Deployment Path Analysis for Cooperative ITS Systems

Shladover, Steven E.
2009

Although the performance advantages of cooperative ITS systems are generally appreciated, the deployment challenges that they pose represent a significant impediment. This report begins with a summary of the types of deployment challenges faced by cooperative information systems and cooperative vehicle-highway automation systems (CVHAS), both of which require coordination of deployment of vehicle and infrastructure-based elements. The institutional challenges are discussed first, followed by the technological challenges. In each case, current progress in overcoming these challenges is...

Establishing Infrastructure Requirements for Bus Rapid Transportation Operations in Dedicated Bus Lanes

Monismith, Carl L., P.E.
Weissman, Shmuel L., PhD
Popescu, Lorina
Santero, Nicholas J.
2008

Bus Rapid Transit (BRT) has the potential to improve mass transit service and contribute to reduced traffic congestion in urban areas. To achieve this improvement in service BRT will require the use of dedicated bus lanes together with lane assist and precision docking (LA/PD) to accelerate the passenger boarding process. Using this approach, BRT lanes can be reduced somewhat in width. However, such a reduction will result in increased channelization of traffic which in turn can lead to a more rapid development of pavement distress. With today’s improved pavement engineering technology, it...

A Research Roadmap for Transportation and Public Health

Sandt, LS
West, A
Johnson, S
Brookshire, K
Evenson, K
Blackburn, L
Peach, K
Tartala, M
Ricklin, A
Shah, S
Rodriguez, D
Coburn, J
2019

Develop a holistic and strategic research roadmap–Identify evidence to support practical and useful information, and implementable tools, for state DOTs and partners.

Effects of Cooperative Adaptive Cruise Control on Traffic Flow: Testing Drivers' Choices of Following Distances

Shladover, Steven E.
Nowakowski, Christopher
Cody, Delphine
Bu, Fanping
O’Connell, Jessica
Spring, John
Dickey, Susan
Nelson, David
2009

A Cooperative Adaptive Cruise Control (CACC) system has been developed by adding a wireless vehicle-vehicle communication system and new control logic to an existing commercially available adaptive cruise control (ACC) system. The CACC is intended to enhance the vehicle-following capabilities of ACC so that drivers will be comfortable using it at shorter vehicle-following gaps than ACC. If this is shown to be the case, it offers a significant opportunity to increase traffic flow density and efficiency without compromising safety or expanding roadway infrastructure.This report describes the...

VII California: Development and Deployment— Lessons Learned

Misesner, Jim
Dickey, Susan
VanderWerf, Joel
Shrafasaleh, Ashkan
Li, Kang
Tan, Han-Shue
Li, Meng
Zou, Zhi-jun
Bu, Fanping
Huang, Ching-Ling
Xu, Guan
Shladover, Steven;
Kuhn, Tom
Barth, Matt
Todd, Michael
Zhang, Wei-Bin
2009

This PATH Research Report covers the (Vehicle-Infrastructure Integration) VII California Development and Deployment (Task Order 5217) efforts from October 2005 – December 2007. Because TO 5217 is followed by the continuation TO 6127, it is a compendium of very applications-oriented research to date as well as a final report to TO 5217.It is organized to impart the very specific and generally very pragmatic implementation details first, beginning with an introduction (Section 1), description of VII hardware, general network and installation (Section 2), then progressing to a more detailed...

A Vehicle to Roadside Communications Architecture for ITS Applications

Lo, Tetiana
Varaiya, Pravin
2000

In this report we present a framework to assist Intelligent Transportation Systems (ITS) providers in the deployment of ITS user services requiring wide-area wireless communi-cations. We examine a scenario in the San Francisco East Bay Area for the 1995 time frame and determine the applicable ITS user services and wide-area wireless messaging requirements. Using the programming language SHIFT we investigate the uplink perfor-mance of a leading wireless candidate, Cellular Digital Packet Data in terms of its ability to support vehicle-to-roadside ITS applications during normal peak-period...