Comparison of Netsim Results with Field Observations and Webster Predictions for Isolated Intersections (original) (raw)

Evaluation-of Traffic Flow and Traffic Network Management.pdf

Amman city, the capital of Jordan has suffered from the impacts of highway mode of transportation. Traffic network management system aim to reduce traffic congestion, delay, fuel consumption, and air and noise pollution. Also, to improve the level of service (LOS) of the urban streets and intersections. This research paper is an engineering project management study; it is about improving traffic network management system in Al Shmesani district in Amman. It was conducted on a network of two main arterials with eight signalized intersections. They are Al Kindi street continued with Prince Shaker Bin Zaid street and Al Sharif Naser Bin Jamel street. The traffic data was collected from the government records at several departments in Amman Municipality and Directorate of Public Security. Highway Capacity Software HCS2000 and updated Synchro-8 programs software were used to evaluate the traffic conditions at each intersection for years 2012 and 2022. The evaluation shows that the intersections are operating at LOS F with high delay time and high saturation flow. Two alternatives were used to improve the traffic conditions. The first one is to change the existing timing plan of the traffic signal to optimize timing plan, this showed little improvement in traffic condition. The second alternatives are to modify the geometric conditions with changing and optimizing the timing plan of the signalized intersections. It showed good improving in the traffic conditions and saving in delay time and fuel consumption at the existing and the future conditions. The Level of Service LOS's of the intersections were improved from LOS F to LOS C, D and E. It showed also the average overall saving in vehicle delay is about 87.75% and the saturation flow is improved at all intersections to less than one. The fuel consumption is also reduced with about 93%.

Ce 391L - Fall 2002 (14615) Advanced Traffic Engineering

2002

Instructor: Dr. Randy Machemehl Office: ECJ 6.902 Phone: 471-4379 E-mail: rbm@mail.utexas.edu Office Hours: MW, 2:00-3:00 p.m., other times by appointment Lecture: TTH 11:00-12:30 p.m., ECJ 5.418 Textbook: Traffic Flow Fundamentals, by Adolf D. May, Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1990, ISBN 0-13-926072-2 Course Supplement: Class Notes Optional (Available at Speedway Printing) Notes available at http://courses.utexas.edu Prerequisites for CE 391L: Graduate standing required. Homework: Homework problems are normally due the next class meeting after assigned. All problems must be handed in at the beginning of the period in which they are due. After this time, they are considered late; however, all assigned problems must be handed in before the final exam or the instructor will consider the student's work incomplete and will award grades accordingly. Attendance: Attendance at all scheduled class meetings is mandatory. A sign up sheet will be circulated each class...

The Impacts of Emergency Vehicle Signal Preemption on Urban Traffic Speed

Journal of the Transportation Research Forum, 2012

We used GPS data from paratransit vehicles to evaluate the impact of emergency vehicles on urban traffic speeds. The results indicate that speed variance is significantly higher during emergency preemption and the mean speeds of traffic flowing in the same direction as the emergency vehicle and on crossing streets are lower during preemption than during normal conditions. Regression results indicate that traffic on major arterials and traffic in the opposite direction of the emergency vehicle tend to have higher speed during signal preemption. Signal preemption during peak periods and duration of preemption had a significant negative impact on traffic speeds. Also, the transition time has a negative impact on traffic speeds. The authors recommend further research on how to optimize (minimize) the preemption duration as well as transition time. Also, the impact of median type and number of lanes should be evaluated. Engineering at the University of Nevada, Las Vegas. He received his Ph.D. from Purdue University. His research interests are in the areas of Intelligent Transportation Systems, transportation planning, demand modeling, air quality analysis, and freight transportation systems. Valerian Kwigizile is an assistant professor of civil engineering at the West Virginia University Institute of Technology, Montgomery, WV. He earned his Ph.D. from the University of Nevada, Las Vegas, and a masters degree from the Florida State University. He also holds a B.S. civil engineering degree from the University of Dar-Es-Salaam, Tanzania. His research interests include transportation modeling and planning, traffic safety, simulation and operations, application of intelligent transportation systems, air quality analysis, and GIS application in civil engineering. He is a member of the Institute of Transportation Engineers and an associate member of the American Society of Civil Engineers.

Coordination of traffic signals across jurisdictional boundaries: field and modeling results

… Research Board 79th …, 2000

The Phoenix Metropolitan Model Deployment Initiative (MMDI) is a seven-year project that attempts to develop and integrate intelligent transportation systems for the Phoenix Metropolitan area. As part of this project, this paper provides some insight as to the potential benefits of coordinating traffic signals across jurisdictional boundaries along the Scottsdale/Rural Corridor in the cities of Tempe and Scottsdale, Arizona. In addition, the paper demonstrates the feasibility of using GPS second-by-second speed measurements and simulation tools for the evaluation of environmental and safety impacts of operationallevel traffic improvement projects. The simulation results demonstrate the unique opportunities that simulation tools provide for conducting different sensitivity analyses and for the evaluation of conditions that are not necessarily observed in the field. Finally, the paper demonstrates that optimizing the location of the break in traffic signal coordination can impact the efficiency of travel, the environment and the number and severity of vehicle crashes.

Synopsis of Traffic Simulation Models

1996

Computer simulation modeling is an established tool for assessing traffic operations. Over the past three decades, a variety of traffic simulation models have been developed, and many experiments and applications of these traffic simulation models to imaginary and real traffic operations have been conducted. This paper is intended to review widely used and newly developed models, in terms of modeling mechanisms, characteristics, and applications. Traffic simulation theories and approaches are briefly described. Simulation models developed for different traffic systems are then reviewed, including those for urban networks, freeways and integrated urban street/freeway systems. Important issues on model application are discussed.

Evaluation Of Highway Bottlenecks

1991

This is the final report of the PATH research project "Bottleneck Evaluation Model." The goal of the project was to develop a computer tool for evaluating capacity and travel time benefits of PATH improvements. The Bottleneck Traffic Simulator (BTS) is used to investigate the time benefits of changes in highway design and operation. Key issues include the effects of (1) highway reliability, in the form of incident frequency, duration and reliability; and (2) changes in traveler behavior, in the forms of arrival time choice and reneging.