PATH

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.

Evaluate High Potential Areas for Overweight Trucks and Truck Accidents in California

Huang, Jihua
Chan, Ching-Yao
Jang, Kitae
2013

To increase operational efficiency, reduce congestion, and meet federal requirements concerning truck size and weight limits, the California Department of Transportation (Caltrans) is exploring new plans and feasible projects designed to increase enforcement and reduce pavement damage due to overweight trucks. Installation of Weigh-in-motion (WIM) systems or Virtual Weigh Station (VWS) by Caltrans will provide information to the California Highway Patrol (CHP) that they can use to better enforce commercial vehicle laws in those areas. To support the effective deployment of WIM/VWIM...

Models of Vehicular Collision: Development and Simulation with Emphasison Safety II: On the Modeling of Collision between Vehicles in a Platoon System

O'reilly, Oliver M.
Et. al.
1997

In this report, an algorithm for the detection of collision between two vehicles is presented. The mechanical models used for the vehicles are based on the theory of a Cosscrat point. Here, we find it convenient to establish the corresponding models using the theory of a psuedo-rigid body. This theory facilitates the development of our collision-detection algorithm. The report concludes with four examples of vehicular impact scenarios in order to illustrate the applicability of the proposed algorithm.

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.

PLANTiS: Organization And Integration Of Modules

Paramsothy, Thananjeyan
Khattak, Asad
Lovell, David
Kanafani, Adib
1995

This paper discusses the integration of PLANiTS (Planning and Analysis Integration for Intelligent Transportation Systems) components. The integration is achieved by defining a structure for representing transportation improvement actions, performance measures and environment in terms of spatial, temporal and user dimensions. A discussion is also presented on the key issues related to computer implementation including data dimension, a data dictionary, data modeling, and data transformations. A basis is developed for the next implementation of PLANiTS.

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.

Development of a Heavy-Duty Diesel Modal Emissions and Fuel Consumption Model

Barth, Matthew
Younglove, Theodore
Scora, George
2005

There have been significant improvements in recent years in transportation and emissions modeling, in order to better evaluate transportation operational effects and associated vehicle emissions. In particular, instantaneous or modal emissions models have been developed for a variety of light-duty vehicles. To date, most effort has focused primarily on developing these models for light-duty vehicles with less effort devoted to Heavy-Duty Diesel (HDD) vehicles. Although HDD vehicles currently make up only a fraction of the total vehicle population, they are major contributors to the...

A Specification Of An Automated Freeway With Vehicle-borne Intelligence

Hitchcock, Anthony
1992

The focus of this work is to derive a technique of safety analysis for an automated freeway system. To demonstrate the method of safety analysis a procedure called fault tree analysis is applied. The specified freeway operates with vehicles in platoons. The safety criterion used here is that two or more simultaneous faults must occur independently before the hazards can arise.

Safety and Throughput Analysis of Automated Highway Systems

Godbole, Datta N.
Lygeros, John
2000

We investigate the effect of a number of design alternatives on the safety and capacity of an Automated Highway System. Our methodology makes use of two computational tools, designed to highlight the fundamental limitations of the vehicle dynamics, sensing and control strategies and inter-vehicle communication. The first tool produces the minimum spacing necessary for two vehicles not to collide, as a function of their state and capabilities. The second tool investigates the multiple collisions that may occur in a string of vehicles if the spacing requirements of the first tool are...