PATH

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.

Deploying Electronic Tolls

Levinson, David
Chang, Elva
2000

This paper examines the deployment of electronic toll collection (ETC) and develops a model to maximize social welfare associated with the toll plaza.

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.

A Planning Methodology For Intelligent Urban Transportation Systems

Kanafani, Adib
Khattak, Asad
Crotty, Melanie
Dahlgren, Joy
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...

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...

A Token-Ring Medium-Access-Control Protocol with Quality of Service Guarantees for Wireless Ad-hoc Networks

Attias, Roberto
Lee, Duke
Puri, Anju
Tripakis, Starvros
Sengupta, Raja
Varaiya, Pravin
2001

This report describes the design and implementation of a wireless token bus protocol for local area networks. This is the second wireless token passing protocol that has been jointly designed by the PATH program and the faculty and students of the EECS department at UC Berkeley.The first wireless token bus protocol, designed by Duke Lee and Professor Pravin Varaiya, was successfully implemented to provide the wireless network required by an automated vehicle platoon. The token passing mode of wireless medium access control was chosen to provide the delivery time guarantees required by the...

The Naturalistic Driver Model: Development, Integration, and Verification of Lane Change Maneuver, Driver Emergency and Impairment Modules

Cody, Delphine
Tan, Swekuang
Caird, Jeff K.
Lees, M.
Edwards, C.
2005

The need for a drivers’ model that integrates a wider range of natural driver activities is important to the traffic engineering and human factors communities. Integration of real traffic behaviors into micro-simulations increases the accuracy and explanatory power of these models. For human factors engineers, improvements to driver modeling efforts provide a useful framework by which Intelligent Transportation Systems (ITS) can be evaluated for safety and mobility. This project includes a means to consider normal lane changing maneuver, driver support for emergency management and impaired...

Cooperative Multiple-Sensor Fusion for Automated Vehicle Control

Hedrick, J. K.
Jang, J.
Potier, A.
2004

The number and quality of sensors available for both on-board vehicle and infrastructure-based sensing is increasing while the cost of these sensors is rapidly decreasing. On-board vehicle sensors can be utilized for both individual vehicle safety as well as automated vehicle control. It is becoming imperative that "fusion" techniques be developed, i.e., methods to combine the wide variety of sensors available so that reliable and accurate information can be obtained even though individual sensors may fail or become extremely noisy. The process of sensor fusion combines multiple sensor...

Integration of GPS-aided INS into AVCSS

Farrell, Jay
Barth, Matthew
2000

This report describes the results of an effort to implement and analyze the performance a vehicle control system using control state information obtained from a carrier phase Differential Global Positioning System (DGPS) aided Inertial Navigation System (INS). Keywords: Vehicle Positioning Systems, Global Positioning System, Inertial Navigation, Differential Carrier Phase, Advanced Vehicle Control

Automatic Steering For Conventional Truck Trailers: Development and Assessment of Operating Concepts for Improving Safety, Productivity and Pavement Durability

Tsao, H.-S. Jacob
Dessouky, Yasser
Rangavajhula, Krishna
Zeta, Joseph Benjamin
Zhou, Lihong
2006

Trucking productivity can be significantly increased by moving freight with longer combination vehicles (LCVs). However, LCV operations not only raise safety concerns for the surrounding traffic and the LCV drivers themselves but also can damage roadways and bridges not equipped to support the operations. All the discussion about truck size and weight limitations or about the pros and cons of LCV operations is predicated on the use of conventional tractors and trailers. We however observed that a root cause of several major issues associated with LCV operations is the problem of off-...