Traffic Operations and Management

Evaluation of Bus and Truck Automation Operations Concepts

Tsao, H. S. Jacob
Zhang, Lan
Lin, Lin
Batni, Deepa
2004

Traffic congestion will continue to worsen and likely worsen at a faster rate than ever. People throughput and freight throughput have become critical issues for California and the rest of the nation. PATH has funded with approximately $125K a research project entitled "Evaluation of Bus and Truck Automation Scenarios" jointly proposed by Jan Botha (Principal Investigator) of Department of Civil and Environmental Engineering and Jacob Tsao (Co-PI) of Department of Industrial and Systems Engineering at San Jose State University. This report summarizes the major findings of the research...

Mobile Traffic Management System Test Deployment

Gerfen, Jeffrey Brian
2005

The Mobile TMC and various field elements were developed for Caltrans Division of Research and Innovation (DRI) between 1994 and 2002. These systems were all designed to operate independent of one another to provide on-site traffic data collection, video surveillance, and traffic management functions to support Caltrans TMC operations. Cal Poly researchers integrated these systems and an off-the-shelf changeable message sign into a Mobile Transportation Management System (MTMS). This new and integrated system is capable of operation untethered from a fixed-site Transportation Management...

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...

Traffic Surveillance And Detection Technology Development: New Traffic Sensor Technology Final Report

Malik, Jitendra
Russell, Stuart
1997

This document presents the final report on a project focusing on new traffic sensor technology, mainly video cameras, for traffic surveillance and detection. It describes a Transportation Management Center (TMC), designed for the collation and computation of multi-site statistics. The report discusses the following elements: tracking approach, motion-based grouping, tracking and grouping procedures, vehicle classification, hardware port, parameters computed at the TMC, testing methodology, and test results.

A Combined Traveler Behavior And System Performance Model With ATIS

Khattak, Asad
Al-deek, Haitham
Thananjeyan, Paramsothy
1994

The specific objective of this study is to assess traveler behavior impacts of Advanced Traveler Information Systems (ATIS) technologies and the consequent system impacts at highway bottlenecks caused by incidents and recurring congestion. This research is based on earlier work regarding impacts of congestion on traveler behavior and system performance in the presence of information. In this paper, the authors enhance the previous work and develop a richer and more comprehensive approach for evaluating ATIS technologies. The unique features of this study are: 1) integration of traveler...

Evaluation of Portable Automated Data Collection Technologies: Final Report

Bank, James H.
2008

Portable automated traffic data collection systems were evaluated by means of a series of field demonstrations. Systems demonstrated included (a) temporarily mounted microwave radar sensors intended to provide volume, speed, and/or length classification data for traffic census or various traffic studies; (b) similar sensors mounted on a semi-permanent basis and intended to serve as substitutes for loop detectors in traffic surveillance systems; and (c) low-mounted infrared sensors used for axle counting. The field demonstrations focused on the issues of sensor accuracy for all systems and...

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.

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.

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...