PATH

Safety Performance and Robustness of Heavy Vehicle AVCS

Yih, Paul
Satyan, Krishna
Gerdes, J. Christian
2003

Commercial heavy vehicle research at the California Partners for Advanced Transit and Highways (PATH) program has focused on the development of controllers for partially to fully automated driving environments. Safe performance of Advanced Vehicle Control Systems (AVCS) must be demonstrated for a wide range of operating conditions and truck configurations to avoid any one of the many failure modes-such as rollover or jackknifing-common to articulated heavy vehicles. For this purpose, a multi-body dynamic model of a tractor semitrailer has been developed using a commercially available...

A Futures Market for Demand Responsive Travel Pricing

Fournier, Nicholas, PhD
Patire, Anthony, PhD
Skabardonis, Alexander, PhD
2023

Dynamic toll pricing based on demand can increase transportation revenue while also incentivizing travelers to avoid peak traffic periods. However, given the unpredictable nature of traffic, travelers lack the information necessary to accurately predict congestion, so dynamic pricing has minimal effect on demand. Dynamic toll pricing also poses equity concerns for those who lack other travel options. This research explores a potential remedy to these concerns by using a simple “futures market” pricing mechanism in which travelers can lock in a toll price for expected trips by prepaying for...

A Futures Market for Demand Responsive Travel Pricing

June 25, 2024

Authors: Nicholas Fournier, Ph.D., Postdoctoral Researcher, SafeTREC, PATH, University of California, Berkeley; Anthony Patire, Ph.D., Research & Development Engineer, PATH, University of California, Berkeley; and Alexander Skabardonis, Ph.D., Professor, Department of Civil & Environmental Engineering, University of California, Berkeley.

Abstract:

Dynamic toll pricing based on demand can increase transportation revenue while also incentivizing travelers to avoid peak traffic periods. However, given the unpredictable nature of...

Methods Of Analysis Of Ivhs Safety: Executive Summary

Hitchcock, Anthony
1992

This report presents the executive summary to a study on developing and demonstrating methods by which the safety of Intelligent Vehicle Highway Systems (IVHS) can be assured, assessed and evaluated. Safety considerations were studied for automated freeways, driver aids and copilots. Management and policy issues are briefly discussed in conclusion.

Layout, Design And Operation Of A Safe Automated Highway System

Hitchcock, Anthony
1995

This paper is concerned with the consequences of control system failures and external intrusions to a fully Automated Highway System (AHS). A model has been developed which enables the casualty rates in lines of automated vehicles to be calculated, following an initial event. It is applied to several situations here for a variety of possible physical layouts and operational modes of an AHS. It is believed that these configurations encompass all those proposed which are economically attractive, and that the accident types encompass the most important ones. For all accident types, there is...

Fault Detection And Identification With Application To Advanced Vehicle Control Systems: Final Report

Douglas, R. K.
Speyer, J. L.
Mingori, D. L.
Chen, R. H.
Malladi, D. P.
Chung, W. H.
1996

This study reports on a preliminary design of a health monitoring system for automated vehicles. A new detailed nonlinear vehicle simulation which extends the current simulation is documented and will be used as a future testbed for evaluating the performance of the health monitoring system. A health monitoring system has been constructed for the lateral and longitudinal modes that monitors twelve sensors and three actuators. The approach is to fuse data from dissimilar instruments using modeled dynamic relationships and fault detection and identification filters.

Evaluating the Costs and Benefits of Transit Smart Cards

Iseki, Hiroyuki, PhD
Demisch, Alexander
Taylor, Brian D., PhD
Yoh, Allison C., MA
2008

Smart cards are gaining momentum as transit agencies across the country have been implementing them as a fare medium. Smart cards hold the promise of revolutionizing the way riders use transit, and how transit systems operate. But in order to adopt smart cards, transit agencies must purchase new equipment and upgrade their entire fare collection system – a very expensive process. In addition, many of the oft-touted benefits of smart cards are vague, and it is not at all certain if they are worth the high cost of implementation.This study examines how transportation agencies in three...

Adaptive Baud Protocol For Wireless Communication

Eskafi, F. H.
Nassiri-toussi, K.
Liu, G.
1998

In this paper, the authors propose an algorithm that increases and decreases the transmission speed according to a user-specified function. The design objective is to regulate baud as efficiently as possible and ensure that in each transmission interval, transmitter and receiver bauds are equal for some period of time during data transmission. An equivalent discrete-time version of the protocol is verified by using the COSPAN software. Application for this adaptive baud protocol for wireless communication is seen in a platoon setting within an Automated Highway System (AHS).

GPS/GIS Technologies for Traffic Surveillance and Management: A Testbed Implementation Study

McNally, M.G.
Marca, J.E.
Rindt, C.R.
Koos, A.M.
2002

The fundamental principle of intelligent transportation systems is to match the complexity of travel demands with advanced supply-side analysis, evaluation, management, and control strategies. A fundamental limitation is the lack of basic knowledge of travel demands at the network level. Modeling and sensor technology is primarily limited to aggregate parameters or micro-simulations based on aggregate distributions of behavior. Global Positioning Systems (GPS) are one of several available technologies which allow individual vehicle trajectories to be recorded and analyzed. Potential...

Rest Areas – Reducing Accidents Involving Driver Fatigue

Banerjee, Ipsita
Lee, Joon ho
Jang, Kitae
Pande, Swati
Ragland, David
2010

Rest areas are a countermeasure for fatigue; what role do they play in fatigue-related freeway collisions? The present study spatially evaluates fatigue collisions. In California, of 2,203,789 highway collisions recorded between 1995 and 2005, fatigue collisions accounted for 1.3% (‘strict’ definition of fatigue) and 9.7% (‘expanded’ definition). Collisions in the vicinity of rest areas were investigated using two different approaches: 1. 10-miles up/downstream of rest areas 2. Distance traveled from rest areasSample t-tests indicated that both fatigue and non-fatigue collisions decreased...