PATH

Integration of Probe Vehicle and Induction Loop Data: Estimation of Travel Times and Automatic Incident Detection

Westerman, Marcel
Litjens, Remco
Linnartz, Jean-Paul
1996

This research investigates methodologies for fusing and further processing real-time road traffic data collected by probe vehicles and induction loop detectors in order to obtain relevant traffic information that is essential for effective deployment of Advanced Traffic Management Information Systems (ATMIS). Methods for estimating travel times and performing automatic incident detection for ATMIS based on induction loop or probe vehicle data are developed. By properly incorporating additional traffic data from the other source the performance of the developed methods is shown to improve...

Lateral Control of Single Unit Heavy Vehicles

Hingwe, Pushkar
Tomizuka, Masayoshi
1997

This report presents two performance enhancement lateral control designs for single unit heavy vehicles. It is shown that robust performance can be achieved using the techniques on a feedback linearized system.

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.

Integrated Maneuvering Control Design and Experiments: Phase I

Hedrick, J. K.
Varaiya, P.
Narendran, V. K.
Choi, S.-b.
1995

The first section of this report addresses the issues of vehicle control during transition maneuvers in Intelligent Vehicle Highway Systems. Transition maneuvers include automatic lane change of vehicles and merging and splitting of platoons of vehicles in the automated highway system. The second part of the report addresses the issues involved in implementation of the longitudinal control laws for vehicle control in Automated Highway Systems.

Hierarchical Hybrid Control: A Case Study

Godbole, Datta N.
Lygeros, John
Sastry, Shankar
1995

In this paper, a case study of the difficulties encountered in the design of hierarchical, hybrid control systems is presented. The Intelligent Vehicle Highway System (IVHS) architecture proposed for vehicle platooning is used as an example. The authors conclude that the conventional tools currently is use for the design and verification of control systems may be inadequate for the design of hierarchical controllers for hybrid systems. The analysis, while indicating certain shortcomings of the current IVHS design, also contains proposed solutions to these problems.

Advanced Bus Stops for Bus Rapid Transit

Dahlgren, Joy
Morris, Betsy
2005

The Santa Clara Valley Transportation Authority (VTA) is planning a bus rapid transit route on the alignment of its busiest existing route, with 30 stops in each direction. This study was conducted to determine how new technology could best be used to improve these bus stops as well as bus stops on other VTA routes and other bus systems. The study focused on bus passengers’ needs and preferences, available technologies, and the combination of improvements that would be most valued by passengers.Passenger activities at the main bus stop were observed, an on-board passenger survey was...