Roads/Highways

Development Of Binocular Stereopsis For Vehicle Lateral Control, Longitudinal Control And Obstacle Detection

Malik, Jitendra
Taylor, Camillo J.
Mclauchlan, Philip
Kosecka, Jana
1997

This report describes progress in the application of computer vision techniques to the lateral and longitudinal control of an autonomous highway vehicle. A vehicle's lateral dynamics and the design of an appropriate controller for lateral control are investigated. Stereo vision, in conjunction with a scanning laser radar sensor, are studied for providing range information applicable to the longitudinal control problem. The results from the experimental demonstration of this system are reported as part of the National Automated Highway Systems Consortium (NAHSC) Demonstration that took...

Task A-2: Implementation and Management of Electronic Roadway Tolling: Lessons from Successful Cases

Kalauskas, Rebecca
Taylor, Brian D.
Iseki, Hiroyuki
2009

Over the past decade road pricing has moved from the drawing board to practice in projects large and small around the world. But while interest in and experience with electronic roadway tolling is on the rise, political acceptance is not yet widespread and standard models of implementation and management have yet to evolve. Accordingly, this report examines a variety of road pricing projects– some that were smoothly implemented, and others that encountered significant obstacles along the way. Based on these cases and a thorough review of the literature, we draw lessons to guide future...

Connected and Automated Vehicle Policy Development for California

Shladover, Steven
2017

Connected and automated vehicles (CAV) have the potential to confer large benefits to California in economic development (job creation) and in improving the operation of its road transportation network. CAV systems are likely to become one of the most important application domains for modern information technology, employing large numbers of highly skilled people in research, development and implementation wherever the companies that are developing these systems find the local environment most hospitable. The CAV systems are expected to produce significant improvements in roadway capacity...

TASK A-3: Examining the Linkages between Electronic Roadway Tolling Technologies and Road Pricing Policy Goals

Demisch, Alexander
Iseki, Hiroyuki, PhD
Taylor, Brian D.
2009

The surge of road pricing projects in the U.S. and around the globe over the past fifteen years has been enabled by a set of new communication and transportation technologies. There is currently a wide array of technical configurations ranging from systems based on “tried and true” short-range radio communications to experimental systems relying on global positioning satellites. These technologies provide for a more efficient collection of simple tolls, and also facilitate a movement toward more dynamic, variable user fees.In this study, we provide a comprehensive literature review of...

Evaluation Of Mixed Automated/manual Traffic

Ioannou, Petros
1998

The advance in research and development will make the deployment of automated vehicles a reality in the near future. The principal question is whether these technologies will lead to any benefits in terms of safety, capacity and traffic flow characteristics as they penetrate the current transportation system. Another aspect is how to exploit these technologies in order to achieve benefits without adversely affecting the efficiency of the current transportation system and the drivers who cannot afford them. The penetration of automated vehicles into the existing transportation system will...

Two Proposals To Improve Freeway Traffic Flow

Karaaslan, Ufuk
Varaiya, Pravin
Walrand, Jean
1990

The following two proposals are presented: (1) Vehicles are organized in platoons in which the lead car is manually driven and the other cars are under automatic spacing (headway) control. A plausible model of the resulting flow of traffic indicates that, for an average platoon size of 20, the capacity of the freeway increases by a factor of four. (2) A macroscopic model of freeway traffic congestion along with a control law for reducing congestion is presented. Simulation of the resulting closed loop model indicates a dramatic reduction in congestion.

Assessing The Safety Benefits Of Automated Freeways

Anwar, Mohammed
Jovanis, Paul P.
1993

This research is aimed at the identification of all types of accidents that have occurred on freeways which may affect the vehicle movement in the assumed automated left lane. The emphasis was on six-lane or more urban freeways. The accident data was obtained from the California TASAS ( Traffic Accidents Surveillance and Analysis System) data base and were used to identify all the accidents that originated outside the potential automated area and which affected movement of traffic in the leftmost lane.

Transitional Platoon Maneuvers In An Automated Highway System

Hedrick, J. K.
Narendran, V. K.
Chang, K. S.
1992

This report deals with an introduction to the control aspect of platoon maneuvers in Automated Highway Systems. The different platoon maneuvers include lane changes, merge procedures and split procedures. The first part of the report consists of a review of the existing literature in this area. The survey is split up into the quasi-synchronous and vehicle follower controller methods of approach to the problem. The subsequent sections deal with the mathematical description of the problem with two representations of the system under study, varying only in level of model complexity. The...

An Investigation Of The Costs Of Roadway Traffic Congestion: A Preparatory Step For IVHSBenefit's Evaluation

Miller, Mark A.
Li, Kayin
1994

This report focuses on traffic congestion under current road conditions with the objective of developing a quantitative understanding of their costs. The work is intended to provide a foundation upon which to build later estimates of the benefits that could be attributable to the use of Intelligent Vehicle Highway Systems (IVHS) technologies. The report gives an overview of traffic congestion and summarizes the principal sources of research in the areas of quantifying the costs of congestion. It reviews this past work relative to the usage of data, methodological approaches used in the...

Formal Specification And Verification Of The Entry And Exit Maneuvers

Sachs, S. R.
Varaiya, P.
1996

This report studies the technical deployment of an Automated Highway System (AHS), and specifically, the interface between an AHS and Urban Arteries (UA). The report focuses on four tasks: 1) specify physical arrangement, operational procedures for entry/exit, 2) conceptualize functions of transfer zone between the AHS and UA, 3) characterize interaction between AHS and UA, and, 4) propose ways of controlling the interaction.