PATH

Are Public-Private Partnerships a Good Choice for U.S. Highways? A Review of the Literature

Iseki, Hiroyuki PhD
Taylor, Brian D.
Uchida, Kansai, MA
2009

In light of chronic funding shortfalls and waxing highway construction and maintenance demands, public private partnerships (PPPs) (often though not always in conjunction with road pricing) have been garnering increasing attention from government officials in the U.S. and abroad. Despite many strongly-held opinions on PPPs – both pro and con – systematic evaluations of their efficiency, effectiveness, equity, and feasibility are all too rare.This paper is the first part of a research project that aims to rectify this shortage of careful, evenhanded, and rigorous analyses of PPPs by drawing...

Hierarchical Hybrid Control Of Automated Highway Systems

Godbole, Dattaprabodh Narhar
1995

The goal of this dissertation is to design controllers that guarantee collision-free operation of vehicles on an Automated Highway System (AHS) using platooning. It begins with an overview of the AHS control system. The individual layers of the hierarchical control architecture for platooning are described, followed by a brief introduction to hybrid systems. This is then followed by a description of the design of a regulation layer feedback controller for the leader of a platoon. The next section contains the design of an interface between this feedback controller and the discrete event...

Truck CACC System Designand DSRC Messages

Lu, Xiao-Yun
Shladover, Steven
2018

This report documents the modeling, control design and implementation logic of the CACC (Cooperative Adaptive Cruise Control). Intuitively, CACC is based on ACC by adding intervehicle communication. This does not mean that CACC control design is simply adopting ACC control design with DSRC passed information from the forward vehicle(s). The deep reason is that: ACC control does not need to consider string stability in multi-vehicle following since it is for a single vehicle. It is fine as long as the feedback control is robustly stable with respect to all the disturbances from the external...

Integrating ITS Alternatives into Investment Decisions in California

Dahlgren, Joy
Lee, Jr. Douglass B.
2004

The purpose of the study was to document the process by which decisions are made in California about implementing intelligent transportation systems (ITS) projects, and to consider ways for "mainstreaming" ITS in the sense of evaluating ITS projects alongside non-ITS projects. The transportation planning and decision process is reviewed and described as a base for judging the efficacy of decisions with respect to the adoption of (ITS) projects. The decision process is complex and varied, involving government agencies at federal, State, regional, and local levels, but the process seems to...

Highway Electrification And Automation

Shladover, Steven E.
1992

This report addresses how the California Department of Transportation and the California PATH Program have made efforts to evaluate the feasibility and applicability of highway electrification and automation technologies. In addition to describing how the work was conducted, the report also describes the findings on highway electrification and highway automation, with experimental results, design study results, and a region-wide application impacts study for Los Angeles.

ITS Hardware Maintenance Management Systems: White Paper for MORIP Pooled Fund Study

Kuhn, Beverly T.
Durkop, Brooke R.
2001

With the planning, design, construction, integration, and operation of transportation management centers and intelligent transportation system (ITS) technologies spreading throughout the country, various agencies are responsible for operating and maintaining these complex and expensive systems. One of the challenges associated with these systems is tracking the maintenance history of the various system hardware components to determine the actual cost of maintaining these systems using a long-term perspective. This cost information can then be used for a variety of purposes, including...

California Intersection Decision Support: A Systems Approach to Achieve Nationally Interoperable Solutions II

Misener, James A.
Chan, Ching-Yao
Cody, Delphine
Dickey, Susan
Nowakowski, Christopher
Greenhouse, Dan
Ragland, David
Shladover, Steven E.
Vanderwerf, Joel
2007

The overall IDS research plan was constructed to realize, in slightly more than three years, the requirements, tradeoffs assessment, and technology investigations necessary to define an IDS. Toward the end of the project we will combine our understanding of the problem definition, IDS technologies and our integration experience with a standard Caltrans intersection (with advanced controller) and design a deployable IDS demonstration that can be field-tested.With the availability of sensing, communication, and computing technologies, IDS systems are promising for the reduction of crashes,...

Los Angeles Smart Traveler Field Operational Test Evaluation

Giuliano, G.
Hall, R.
Golob, J.
1995

This study evaluates the performance and effectiveness of the Smart Traveler Advanced Traveler Information System (ATIS). The project is designed as a field operational test of three different media approaches for providing traveler information: fully automated telephone systems, automated multi-media touch screen kiosks, and PC via modem. The program is evaluated in terms of technical function, cost, user response and overall effectiveness.

Safety Analysis Of Automated Highway Systems

Leveson, Nancy G.
1997

This report focuses on the safety analysis techniques and tools as they are applied to Automated Highway Systems (AHS). The report begins with a description of the AHS model. This is followed by a discussion of the basic features of Requirements State Machine Language (RSML) relevant to the model. The report concludes with a description of the safety analysis techniques, including forward and backward simulation, generation of fault trees, and consistency and completeness analysis..

Fault Tolerant Lateral Control for Transit Buses and Trucks

Suryanarayanan, Shashikanth
Hsiao, Tesheng
Tomizuka, Masayoshi
2004

This report documents the research results of Task Order 4205 (TO4205), Fault Tolerant Lateral Control for Transient Buses and Trucks performed during 2000-2003. In this task order, we studied the procedures for designing real-time lateral control systems for automated vehicles that are not sensitive to failures of the two key components: a set of magnetometers at the front bumper and another set at the rear bumpers. This problem is important because failures related to either front or rear magnetometers may have immediate effect on the stability of the closed loop control system.