Connected and Automated Vehicles

Spacing And Capacity Evaluations For Different Ahs Concepts

Kanaris, Alexander
Ioannou, Petros
Ho, Fu-sheng
1996

In this study, the authors consider a family of six Automated Highway Systems (AHS) operational concepts. For each concept, the minimum inter- vehicle spacing that could be used for collision-free vehicle following, under different road conditions, is calculated. For architectures involving platoons, the authors also use the alternative constraint of bounded energy collisions to calculate the spacing that can be applied if collisions at a limited relative velocity were allowed. In every case, the minimum spacing in turn, is used to calculate the maximum possible capacity that could be...

Design Of Fault Tolerant Control Systems For Ahs

Sastry, S.
Horowitz, R.
Hedrick, K.
1998

This report describes research in the area of fault detection and handling designs used in the longitudinal control system of platooned automated vehicles. Results are presented on experimental testing of the designs. The authors also describe a consistent interface between the fault detection and handling modules and how it was implemented in the SHIFT programming language for the specification of hybrid systems. In addition, the report describes part of the modeling formalism required for the formal verification of safety claims.

Feasibility of A Gyroscope-free Inertial Navigation System for Tracking Rigid Body Motion

Tan, Chin-Woo
Mostov, Kirill
Varaiya, Pravin
2000

We study the feasibility of designing an accelerometer-based gyroscope-free inertial navigation system (INS) that uses only accelerometers to compute the linear and angular motions of a rigid body.

Position Location in AHS by Magnetic Pseudo-Noise Signals

Bana, Soheila V.
Varaiya, Pravin
1999

This paper proposes a novel method for position location by automated vehicles in AHS. The proposed positioning system meets the desired accuracy for AHS and is economically feasible because it takes advantage of the infrastructure and characteristics of the automated roads. This positioning system is very similar to GPS in the sense of using pseudo-noise codes for range measurement. The phase of a pseudo-noise signal can be mapped to the receiver's range from a reference point where the signal correlation properties in sure accurate phase estimation. The magnetic markers that are...

Ventura/Lompoc Smart Card Demonstration Evaluation: Final Report Volume 1 Technical Performance, User Response, and Institutional Analysis

Giuliano, Genevieve
Moore, II, James E.
Golob, Jacqueline
1999

This report presents evaluation results of the Smart Card Phase III FieldDemonstration. Its purpose is to demonstrate the feasibility of using Smart Cards and othertechnology to provide an integrated fare medium across several transit operators. TheDemonstration took place from May 1995 through June 1997, and it was located in VenturaCounty, California. Participants included seven transit agencies, with the Ventura CountyTransportation Commission acting as the lead local agency. The technology deployed is anintegrated fare transaction and vehicle management/monitoring system, termed...

Advancing Research in Transportation and Public Health: A Selection of Twenty Project Ideas from a US Research Roadmap

Dannenberg, AL
Rodriguez, D
Sandt, LS
2021
Transportation policies and projects have multiple impacts on health. Research on these impacts can help promote positive and reduce adverse health consequences of decisions made by transportation agencies. In 2019 the U.S. National Cooperative Highway Research Program published a research roadmap for transportation and public health based on an extensive literature search and key informant interviews. The roadmap identified 44 research gaps and 122 research needs on a wide range of relevant topics. From this list, using pre-established criteria including specificity, equity, potential impact...

Integrated Maneuvering Control Design And Experiments: Phase II

Hedrick, J. K.
Pantarotto, M.
Yoshioka, T.
Chen, Y.
Connolly, T.
Narendran, V. K.
1996

This report begins with an examination of autonomous lateral vehicle control. This is followed by a section on Cooperative Intelligent Cruise Control (CICC). The effect of communication delays on the control performance of vehicle platoons is then examined. The report concludes with a study of the three basic transition maneuvers in an Automated Highway System: join, split, and lane change.

Issues In Fault Tolerant Control Of Vehicle Follower Systems

Hedrick, J. K.
Garg, V.
1994

The aim of this report is to study issues concerning fault detection and identification in vehicle follower control. The report discusses various potential fault modes among sensors, and actuators used in the vehicle following experiments in cars. It deals with issues of fault detection of sensors and actuators for vehicle following applications.

Development and Performance Evaluation of AVCSS Deployment Sequences to Advance from Today's Driving Environment to Full Automation

Shladover, Steven
VanderWerf, Joel
Miller, Mark A.
Kourjanskaia, Natalia
Krishnan, Hariharan
2001

This report presents the findings of its investigation into deployment sequences to better understand the paths that could be taken from today's driving environment to vehicle-highway automation. One of the most vexing problems has always been that of determining how to advance from the present-day manually-controlled vehicles to the future fully automated vehicles. Considerable research attention has been devoted to defining the architecture and operating protocols, as well as the technology, of automated highway systems. Rather less attention has been devoted to defining the steps by...

Object Management Systems

Gollu, Aleks Ohannes
1995

This thesis describes a new approach for developing large-scale object- oriented software systems, called Object Management Systems (OMS). The OMS development methodology consists of four stages: Domain Customization, System Architecture, Application Development, and System Test. The methodology is demonstrated by implementing the SmartAHS simulation framework, a Customized Object Model. SmartAHS is used to capture different Automated Highway System (AHS) designs and benchmark scenarios and to generate performance metrics through micro-simulation of the designs. The California PATH Program...