Roads/Highways

Testing A Proposed Decision-Oriented Framework To Understand Its Deployment Issues: An Examination Of The Travinfo Atis Project

Miller, Mark
1998

Deployment is at the forefront of current activity in California in the field of intelligent transportation systems. It is important to understand the multitude of issues associated with such deployment to increase the likelihood of a successful deployment initiative. A review and synthesis of the literature on deployment issues have been performed. This served as a basis for development of a proposed decision-oriented framework that may be used to recognize and organize issues for the deployment of intelligent transportation systems. The applicability of this framework to intelligent...

Some Traffic Features at Freeway Bottlenecks

Cassidy, Michael J.
Bertini, Robert L.
1999

Observations from two freeway bottlenecks in and near Toronto, Canada indicate that the average rate vehicles discharge from a queue can be 10% lower than the flow measured prior to the queue's formation. Absent any influences from downstream, the queue discharge flows exhibited nearly stationary patterns that alternated between higher and lower rates. These alternating flow patterns were especially evident at one of the two sites, although the feature occurred at both sites during periods that immediately followed the onset of upstream queueing; i.e. a queue's formation was always...

Potential Payoffs From IVHS: A Framework For Analysis Appendix C

Rockwell International Science Center
1992

This Appendix documents the details of the Intelligent Vehicle Highway Systems (IVHS) benefit analysis DEMOS models and provides the PATH user information about what is contained in and how to use the models. The object of this study was to structure an approach to evaluate the relationships of the top-level IVHS goals to the implementable actions and assess the relative benefits of those actions. The DEMOS model has been used as a tool to analyze selected IVHS actions with the goal of determining the key driving parameters through the use of sensitivity analysis.

Modeling and Simulation Of The Automated Highway System

Eskafi, Farokh H.
1996

This report presents the hierarchical structure for the control design of an Automated Highway System (AHS). This control hierarchy has four layers: network, link, coordination, and regulation. It is used to model different AHS proposals. Control layers and the internal structure of each layer and the interfaces between then are described. Three basic maneuvers are described: join, split, and change lane. The SmartPath simulation tools are described to enable simulating AHS scenarios. The advantages of SmartPath include providing a graphical interface, providing microsimulation, and also...

Cooperative Adaptive Cruise Control: Testing Drivers’ Choices of Following Distances

Nowakowski, Christopher
Shladover, Steven E.
Cody, Delphine
Bu, Fanping
O'Connell, Jessica
Spring, John
Dickey, Susan
Nelson, David
2011

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. This can offer a significant opportunity to increase traffic flow density and efficiency without compromising safety or expanding roadway infrastructure.This report describes the design and implementation...

Creative Reallocation of Curbs, Streets, Sidewalks Accelerated by the Pandemic May Be Here to Stay

Shaheen, Susan, PhD
Cohen, Adam
Broader, Jacquelyn
2023

Curb space has been traditionally designed for private vehicle parking, public transit, and passenger and commercial loading. However, in recent years, a growing number of newservices and activities have increased the demand for limited curb space, including passenger pick-up and drop-off; last-mile delivery (e.g., courier network services, personal delivery devices); electric vehicle (EV) charging; micromobility parking and use (e.g., personally owned and shared bikes and scooters); and carsharing services. The curb serves a variety of functions such as vehicle and device storage (...

An Integrated Physical/Link-Access Layer Model Of Packet Radio Architectures

Polydoros, Andreas
1994

The goal of this effort is to devise and analyze an integrated Physical/ Link-Access Layer Model of packet Radio Architectures, with application to the PATH/IVHS (Intelligent Vehicle Highway Systems) communication sub- system design between vehicles and infrastructure, as well as between vehicles on the move. The present report contributes to a generic conceptual model for system evaluation which can be used for quantification of the interaction between network layers. The research tasks that have been performed for achieving the project objectives include collection of data requirements...

A Staggered-Diamond Design For Automated/Manual - HOV Highway-to-Highway Interchange

Tsao, Jacob
1995

This paper proposes a staggered-diamond design for automated connector ramps for an Automated Highway System (AHS). After describing the main features of this design, the paper discusses the constraints on AHS operational design imposed by the requirement for continuous automated highway-to-highway driving. The constraints on AHS evolution due to the same requirement are then discussed.

Travinfo Evalution (Technology Element) Traveler Information Center (TIC) Study (September 1996 - June 1997)

Miller, Mark A.
Loukakos, Dimitri
1998

TravInfo is a Field Operational Test of advanced traveler information systems for the San Francisco Bay Area, sponsored by the Federal Highway Administration (FHWA). The project involves a public/private partnership which seeks to compile, integrate and broadly disseminate timely and accurate multi-modal traveler information through commercial products and services. The public sector component centers on the Traveler Information Center (TIC), which collects and integrates both static and dynamic traveler information. The TIC began operations in September 1996 and will operate as an FOT...

Smart Parking Management Field Test: A Bay Area Rapid Transit (BART) District Parking Demonstration: Final Report

Rodier, Caroline J., PhD
Shaheen, Susan A., PhD
Kemmerer, Charlene
2008

This report presents an evaluation of the first transit-based smart parking project in the U.S. at the San Francisco Bay Area Rapid Transit (BART) District station in Oakland, California. The report begins with a review of the smart parking literature; next the smart parking field test is described including its capital, operational, and maintenance costs; then the results of the participant survey analysis are presented; and finally lessons learned from the institutional, user, and operational perspective are documented. Some key changes in participant travel behavior include increases in...