Roads/Highways

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...

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).

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...

Highway Traffic Data Sensitivity Analysis

Lu, Xiao-Yun
Coifman, Benjamin
2007

This report is divided into two parts:•Part I - Highway Traffic Data Sensitivity Analysis in Systems Approach. This work has been conducted by Dr. Xiao-Yun Lu at California PATH, U. C. Berkeley.•Part II - Empirical and Analytical Results for Sensitivity to Loop Station Spacing. This work has been conducted by Benjamin Coifman in Civil Engineering, Ohio State University.Since the aspects of the problem considered and approaches adopted by the two are different, it is thus necessary to separate the report into two parts. Each part is self-content.

Lessons in Network Management: Cross-Industry Comparisons and Implications for ITS Development

Horan, Thomas A.
Reany, William
2002

This report provides an historical and case study analysis of policies aimed toward the management of complex systems, with specific reference to the role of public policy and technology in balancing surface transportation system demand and supply. Three case studies form the crux of the paper energy management, airport management, and Internet growth. Lessons from these case studies are then applied to the circumstance of ITS deployment to manage surface transportation in California. Following an introductory section (1), section 2 provides an historical analysis of the forces with have...

High Occupancy Vehicle (HOV) System Analysis Tools: Statewide HOV Facility Performance Analysis

Jang, Kitae
Chan, Ching-Yao
Du, Yao-Qiong
Chu, Lianyu
Yang, Ming-Hsun
Recker, Will
2012

The two most common types of high occupancy vehicle (HOV) lanes in California are continuous access, prevalent in Northern California, and buffer-separated limited access, prevalent in Southern California. This report describes the evaluation of operational performance of HOV facilities in several regions in California with different access types as well as a before-after comparative study of California facilities where access types were converted in recent years. A set of performance measures were defined and selected to indicate how well the HOV facilities achieve intended goals –...

The AHS/Street Interface; Effects of Capacity Concentration on System Performance: Phase 1 Final Report

Hall, Randolph
2001

This report provides Phase 1 results for MOU 386, “The AHS/Street Interface, Effects of Capacity Concentration on System Performance.” Additional results from this project can be found in PATH Working Paper 2000-26. Within this paper, strategic issues in Automated Highway Interface design are discussed, including creation of interface components and design alternatives, with emphasis on interchange separation and highway orientation. The report also discusses land use issues associated with interchange construction.

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.

Emergency Vehicle Maneuvers and Control Laws for Automated Highway Systems

Toy, Charmaine
Leung, Kevin
Alvarez, Luis
Horowitz, Roberto
2001

In this report control laws and maneuvers for high priority emergency vehicle transit on automated highways are presented. The work presented is specifically designed for use with the Partners for Automated Transit and Highways (PATH) hierarchical control architecture. The types of control laws that are needed for the different hierarchical layers are examined, and specific maneuvers for the coordination and link layers are presented. Simulations using SmartCAP (a mesoscopic traffic simulator) and SmartAHS (a microscopic traffic simulator) demonstrate the maneuvers' functionality.