PATH

Fuel Saving Achieved in the Field Test of Two Tandem Trucks

Browand, Fred
McArthur, John
Radovich, Charles
2004

The fuel consumption of two tandem trucks is recorded for truck spacings of 3, 4, 6, 8, and 10 meters. The trucks are linked by means of an electronic control system, and are operated on an unused runway at Crows Landing, California. Fuel consumption data is averaged while traveling in both directions over the same central strip of runway to cancel the effect of runway slope and to partially cancel the effect of wind. The average fuel consumption saving to be achieved by tandem operation varies from about 11% at 3-4 meters spacing to about 8% at 8-10 meters spacing.

Mobile Traffic Management System Test Deployment

Gerfen, Jeffrey Brian
2005

The Mobile TMC and various field elements were developed for Caltrans Division of Research and Innovation (DRI) between 1994 and 2002. These systems were all designed to operate independent of one another to provide on-site traffic data collection, video surveillance, and traffic management functions to support Caltrans TMC operations. Cal Poly researchers integrated these systems and an off-the-shelf changeable message sign into a Mobile Transportation Management System (MTMS). This new and integrated system is capable of operation untethered from a fixed-site Transportation Management...

A Combined Traveler Behavior And System Performance Model With ATIS

Khattak, Asad
Al-deek, Haitham
Thananjeyan, Paramsothy
1994

The specific objective of this study is to assess traveler behavior impacts of Advanced Traveler Information Systems (ATIS) technologies and the consequent system impacts at highway bottlenecks caused by incidents and recurring congestion. This research is based on earlier work regarding impacts of congestion on traveler behavior and system performance in the presence of information. In this paper, the authors enhance the previous work and develop a richer and more comprehensive approach for evaluating ATIS technologies. The unique features of this study are: 1) integration of traveler...

Task A-2: Implementation and Management of Electronic Roadway Tolling: Lessons from Successful Cases

Kalauskas, Rebecca
Taylor, Brian D.
Iseki, Hiroyuki
2009

Over the past decade road pricing has moved from the drawing board to practice in projects large and small around the world. But while interest in and experience with electronic roadway tolling is on the rise, political acceptance is not yet widespread and standard models of implementation and management have yet to evolve. Accordingly, this report examines a variety of road pricing projects– some that were smoothly implemented, and others that encountered significant obstacles along the way. Based on these cases and a thorough review of the literature, we draw lessons to guide future...

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...

Connected and Automated Vehicle Policy Development for California

Shladover, Steven E.
2017

Connected Vehicles (CV), Automated Vehicles (AV) and their combination as Connected Automated Vehicles (CAVs) have beenamong the most important developments in surface transportation within the past few years. California has been a nationalleader in the development of these technologies and their predecessors for several decades, but that leadership position is injeopardy as other states court CAV development and testing outside of California. The paper suggests Californiaactively engages in CAV through a number of different outlets; encouraging the development of state-of- the-art testing...

TASK A-3: Examining the Linkages between Electronic Roadway Tolling Technologies and Road Pricing Policy Goals

Demisch, Alexander
Iseki, Hiroyuki, PhD
Taylor, Brian D.
2009

The surge of road pricing projects in the U.S. and around the globe over the past fifteen years has been enabled by a set of new communication and transportation technologies. There is currently a wide array of technical configurations ranging from systems based on “tried and true” short-range radio communications to experimental systems relying on global positioning satellites. These technologies provide for a more efficient collection of simple tolls, and also facilitate a movement toward more dynamic, variable user fees.In this study, we provide a comprehensive literature review of...

Compression Braking for Longitudinal Control of Commercial Heavy Vehicles

Moklegaard, Lasse
Druzhinina, Maria
Stefanopoulou, Anna G.
2001

In this report, we develop a detailed crank angle based diesel engine model and a low order engine torque model for a Class 8 commercial heavy vehicle (CHV) as well as longitudinal control algorithms that coordinate the variable compression brake mechanism with service brakes and gear ratios. In particular, we have developed a detailed crank angle based simulation model for a six cylinder, 350Hp diesel engine equipped with a compression brake.

Deploying Electronic Tolls

Levinson, David
Chang, Elva
2000

This paper examines the deployment of electronic toll collection (ETC) and develops a model to maximize social welfare associated with the toll plaza.

A Token-Ring Medium-Access-Control Protocol with Quality of Service Guarantees for Wireless Ad-hoc Networks

Attias, Roberto
Lee, Duke
Puri, Anju
Tripakis, Starvros
Sengupta, Raja
Varaiya, Pravin
2001

This report describes the design and implementation of a wireless token bus protocol for local area networks. This is the second wireless token passing protocol that has been jointly designed by the PATH program and the faculty and students of the EECS department at UC Berkeley.The first wireless token bus protocol, designed by Duke Lee and Professor Pravin Varaiya, was successfully implemented to provide the wireless network required by an automated vehicle platoon. The token passing mode of wireless medium access control was chosen to provide the delivery time guarantees required by the...