Recent Activities

Recent Activities

Total : 12, Page : 1/2

Two research topics have been presented at INFORMS by the ATTAP research team - 2009-10-20 / 15:33:12

1.A corridor signal optimization model based on the enhanced cell transmission model
Zichuan Li, Gang-Len Chang
Abstract:
This study presents a signal optimization model based on the enhanced cell transmission model. Signal optimization has been an interesting research topic for a long time. In this study, some new features are proposed to the original Cell Transmission Model (CTM) model, which improves the performance of modeling the signalized arterial traffic. Based on the proposed model, a signal optimization model is formulated. A Genetic Algorithm (GA) based solution method is proposed to solve this model. To demonstrate its performance, a real site case study with light, moderate, and congestion traffic demands are provided with performance comparison using a third part simulation package, CORSIM.
2. Optimal Control Strategies for Massive Vehicular Pedestrian Mixed Flows in the Evacuation Zone.
Xin Zhang, Gang-Len Chang
Abstract:
This paper presents an integrated model for design of signal plans for massive mixed pedestrian-vehicle flows within the evacuation zone. The proposed model with its embedded formulations for pedestrians and vehicles in the same network can effectively take into their potential conflicts during the evacuation, and generate the optimal routing strategies for guiding evacuees moving toward either the pick-up locations or their parking areas. The core formulations is based on the cell-transmission concept, but the proposed model has been enhanced with the notions of sub cells proposed mainly to capture the complex movements in the pedestrian flows so that it can concurrently optimize both the signals for pedestrian-vehicle flows and the movement directions for evacuees. An illustrating example concerning the evacuation around the M&T stadium area has been used to demonstrate the promising properties of our model.

Chang Awarded $1.23M for Traffic System - 2009-08-31 / 18:49:22

The Maryland State Highway Administration and the Federal Highway Administration have awarded civil engineering Professor Gang-Len Chang $1.23 million for the design and implementation of a real-time traffic monitoring and prediction system for travel to and from Ocean City, Md.

Chang's Traffic Safety and Operations Lab will conduct the project.

The entire project includes operating 40 radar sensors in the Eastern Shore region, developing algorithms for optimizing signal controls in the regional highway networks, providing predicted travel times based on detected traffic conditions and monitoring evacuation traffic flows during major or emergency events such as hurricane attacks.

For more information, please visit the Traffic Safety and Operations Lab web site:

http://www.cee.umd.edu/research/traffic-safety-lab.html
August 21, 2009The Maryland State Highway Administration and the Federal Highway Administration have awarded civil engineering Professor Gang-Len Chang $1.23 million for the design and implementation of a real-time traffic monitoring and prediction system for travel to and from Ocean City, Md.

Chang's Traffic Safety and Operations Lab will conduct the project.

The entire project includes operating 40 radar sensors in the Eastern Shore region, developing algorithms for optimizing signal controls in the regional highway networks, providing predicted travel times based on detected traffic conditions and monitoring evacuation traffic flows during major or emergency events such as hurricane attacks.

For more information, please visit the Traffic Safety and Operations Lab web site:

http://www.cee.umd.edu/research/traffic-safety-lab.html
August 21, 2009

The 15th ITS World Congress presentation - 2008-11-03 / 16:37:48

The following papers produced by the ATTAP research team have been accepted for presentation at The 15th ITS World Congress

EVA495-3D: A Real-Time Optimization, Prediction and Visualization System for Evacuation Operations
Nan Zou, Zichuan Li, Yue Liu, Gang-Len Chang and Alvin Marquess

PEDEVACUATION: The Emergency Evacuation Module of Pedestrians for Washington D.C.
Xin Zhang, Gang-Len Chang, and Alvin Marquess

Analysis of Freeway Incident Duration for ATIS Applications
by Woon Kim, Gang-Len Chang and Steven M. Rochon

Modeling integrated freeway off-ramp control with cell transmission model
Zichuan Li, Gang-Len Chang, and Suhasini Natarajan

The 88th TRB conference in 2009 - 2008-10-21 / 13:06:47

The following papers produced by the ATTAP research team have been accepted for presentation at the 88th TRB conference in 2009:

·A Multi-criteria Approach for Prioritizing Safety Improvement Countermeasures: Applications of Analytical Hierarchy Process with Fuzzy Logic(Jie Yu)
·A Cluster-Based Hierarchical Model for Urban Transit Hub Location Planning: Formulation, Solution, and Case Study(Jie Yu)
·A Dynamic Model for Signal Optimization with Enhanced Traffic Flow Formulations(Yue Liu)
·A Multi-Objective Model for Optimal Diversion Control of A Freeway Corridor under Incident Condition(Yue Liu)
·ATIS Application: Field Test of a Travel Time Prediction System with Widely Spaced Detectors --Algorithms and Results" (Nan Zou)
·An Importance Segregated Multicriteria Optimization Approach For Safety Improvement Project Selection ( H.W. Ho)
·An Integrated Off-ramp Control Model for Freeway Traffic Management (Zichuan Li)

Woon's Graduation - 2007-12-14 / 15:50:20

Woon Kim successfully finished her master's thesis defense.

The thesis title is "Empirical Analysis and Modeling of Freeway Incident Duration".

The Ocean City Project Extension - 2007-12-07 / 18:04:42

The Traffic Saefty and Operations Laboratory recently received an extension phase of $300,000 to enhance its Ocean City traffic monitoring and emergency evacuation systems.

The primary task of this phase is to deploy 30 traffic sensors between Salisbury and Ocean City, and provide estimated travel time via the roadside variable message sign. The proposed system will also enable the research team to investigate the impact of provided travel time information on the route choice behavior of motorists, and monitor the day-to-day evolution of traffic patterns on US50 and MD90 between Salisbury and Ocean City. The laboratory has operated the Ocean City traffic monitoring and evacuation system over the past 3 years and conducted various evacuation and traffic control strategies for the Eastern Shore region. The total research funding, including this extension of six months, has amounted to 1.2 million dollars.

Activities in the 2008 TRB Annual Meeting - 2007-12-07 / 18:02:38

Four papers were accepted for the 2008 TRB 87th annual meeting. The paper titles is

- Empirical Analysis of Missing Data Issues for ATIS Applications: Travel Time Prediction (Nan Zou)
- Empirical investigation of critical factors affecting driver responses during the yellow phase: A case study at six Maryland intersections (Yue Liu)
- A Corridor-Based Emergency Evacuation System for Washigton D.C.: System Development and Case Study (Yue Liu)
- Cluster-Based Optimization of Urban Transit Hub Locations: Methodology and Case Study in China (Jie Yu)

Activities in the 14th ITS World Congress - 2007-12-07 / 17:55:47

Three papers were presented in the 14th ITS World Congress in Beijing, China (10/9/2007 - 10/13/2007)

- A Hybrid Model for Reliable Travel Time Estimation on a Freeway with Sparsely Distributed Detectors (Nan Zou)
- An Integrated Program for Preliminary Evaluation of Unconventional Intersections (Xiaorong Lai)
- Capevacuation: The Corridor-Based Emergency Evaluation System for Washington D.C. (Yue Lie)

Activities in the 10th IEEE Conference on ITS - 2007-12-07 / 17:51:08

Saed Rahwanji, Minseok Kim and Yue Liu attended the 10th IEEE conference on Intelligent Transportation Systems (9/31/2007-10/3/2007).

- Saed and Minseok presented their work on unconventional arterial intersection designs.
- Yue presented his study on drivers' response to a yellow signal phase

Projects Awarded by DHS and MDSHA - 2007-12-07 / 17:47:29

The Traffic Safety & Operations Lab headed by Dr. G.L. Chang has recently been awarded research projects from US Department of Homeland Security and Maryland State Highway Administration

- ITS Technology for Work-zone Travel Time Prediction
- Work-zone Control and Capacity Analysis
- Reduce Intersection Accidents due to Dilemma zones - Phase III
- Real-time Traffic Monitoring and Emergency Management for Eastern Shore - Phase IV
- 2006 CHART Performance Evaluation for Incident Response and Management
- A Knowledge-base System for Prediction of Freeway Incident Duration


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