Intelligent Transportation Systems

Development of System Safety Performance Measures In Support of The Global Analysis and Information Network

Gosling, Geoffrey
1998

In May 1996, the Federal Aviation Administration (FAA) announced a new and innovative approach to reach the goal of "zero accidents," known as the Global Analysis and Information Network (GAIN). This is envisaged as a privately owned and operated international information infrastructure for the collection, analysis, and dissemination of aviation safety information that would involve the use of a broad variety of worldwide aviation data sources, coupled with comprehensive analytical techniques, to facilitate the identification of existing and emerging aviation safety problems. In support of...

Design, Modeling and Control of Steering and Braking for an Urban Electric Vehicle

Maciua, Dragos
1996

This report describes research which involved the design modification, modeling and control of automatic steering and braking systems for an urban electric vehicle. The vehicle is equipped with four-wheel independent drive, four-wheel independent braking and four-wheel steering. Control algorithms were developed for steering and braking. Simulation results show the feasibility of the algorithms.

Design and Implementation of Digital Radio Communications Link for Platoon Control

Li, Wei-yi
1995

This report discusses the design and implementation of inter-vehicle communication systems used in the longitudinal control platoon experiments conducted by PATH (Partners for Advanced Transit and Highways). In the first section of the report, the inter-vehicle communication links implemented in both the two and four vehicles platoon experiments are examined. Lastly, this report investigates some possible future improvements of the communication link used for platoon control experimentation.

Design of a Machine Vision-based, Vehicle Actuated Traffic Signal Controller

Cassidy, Michael
Coifman, Benjamin
1998

This project presents a signal controller algorithm to capitalize on the extended information provided by wide-area detection at isolated intersections. Using computer simulation, different control strategies are evaluated and the performance of the proposed wide-area detection system with conventional signal controllers is compared. The results indicate that wide-area vehicle actuated (VA) control can yield significant improvements over conventional VA control strategies.

Custom Interface Builder Palettes for Advanced Driver Interface Rapid Prototyping

Moore, David W.
1993

This manual provides a brief introduction to four classes of software objects developed to help a user create and test interfaces using these objects in the Interface Builder application environment. The Knob, Dial, Alert Light, and Map object classes presented here represent the beginnings of a software library of virtual interface objects designed to support a rapid prototyping environment for advanced interfaces as described in "Rapid Prototyping of Advanced Driver Interface Systems."

Collision Analysis of Vehicle Following Operations by Two-dimensional Simulation Model: Part I - Effects of Operational Variables

Chan, Ching-Yao
1997

This research project investigates the behaviors of vehicles in collisions, especially when they are closely spaced. The study uses a two- dimensional simulation program, EDSMAC, which allows longitudinal and lateral movements as well as the yaw motion of vehicles. The simulation model calculates impact forces in collisions and estimates the resulting vehicle damage. Collision situations are simulated. The subsequent post- impact vehicle trajectories are then analyzed. By varying parameters in simulation cases, one can evaluate the potential effects of such variables in vehicle-following...

CIRCLES: Congestion Impacts Reduction via CAV-in-the-Loop Lagrangian Energy Smoothing

Bayen, Alexandre M.
Lee, Jonathan W.
Piccoli, Benedetto
Seibold, Benjamin
Sprinkle, Jonathan M.
Work, Daniel B.
2024

The energy efficiency of today’s vehicular mobility relies on the un-integrated combination of i) control via static assets (traffic lights, metering, variable speed limits, etc.); and ii) onboard vehicle automation (adaptive cruise control (ACC), ecodriving, etc.). These two families of control were not co-designed and are not engineered to work in coordination. Recent studies have shown i) limitations of controls, and even ii) negative impacts of ACC. This project focused on the technology development, implementation and prototyping, and validation of Mobile Traffic Control (MTC). MTC...

BTS (Version 1 .1) - Bottleneck Traffic Simulator User’s Manual

Lin, Wei Hua
Hall, Randolph W.
1991

BTS can be used to evaluate a variety of changes in highway design to improve bottlenecks, such as: (1) addition of highway lanes, (2) addition of automated or HOV lanes, or (3) incident management strategies to reduce the frequency, duration and magnitude of incidents. BTS can also be used to project future highway conditions as baselevel traffic grows or driver behavior changes.The new version of BTS was enhanced to include incident dependencies, variable weather conditions, reneging, and randomly varying traffic volumes. As of yet, BTS is not capable of analyzing highway performance on...

Brake System Modeling, Control and Integrated Brake/Throttle Switching Phase I

Hedrick, Karl
Gerdes, J.C.
Maciuca, D.B.
Swaroop, D.
1997

This report is concerned with the modeling and control issues regarding braking in an Intelligent Transportation Systems (ITS) setting. Specifically, it addresses the issue of vehicle control in an automated highway system, brake actuation and coordinated brake and throttle switching. It first presents a hydraulic model of the brake system. A method for designing stable controllers for uncertain, mismatched nonlinear system is then described. A method to estimate the coefficient between the brake pressure at the wheel and the brake torque is presented. The next section describes a...

Assessing the Benefits of a National ITS Architecture

Hickman, M.
Weissenberger, S.
Dahlgren, J.
1996

This paper describes the results of an assessment of benefits from an Intelligent Transportation Systems (ITS) architecture, based on the National ITS Architecture Development program. Benefits of the architecture include those typically attributed to systems engineering and integration. The architecture provides a common framework so that, in planning and implementing systems, state and local agencies can be assured that ITS products and services are compatible and inter-operable with other ITS products and services. More directly, three beneficial features of the national architecture...