ATTAP is jointly initiated by the Office of Traffic and Safety at the Maryland State Highway Administration and the Traffic Safety and Operations Laboratory at the University of Maryland - College Park

Goals and Objectives:

  • Work in partnership with the University of Maryland;
  • Develop state-of-art traffic engineering analysis tools and technologies;
  • Provide traffic engineering technical expertise to University of Maryland students/staff;
  • Develop and maintain an internet based traffic engineering innovation and information resource site; and
  • Provide on site support in traffic engineering analysis and applied operations to the Traffic Development and Support Division/Office of Traffic and Safety - Maryland State Highway Administration.

Recent Activities  (More)


 ATTAP website is currently under maintenance. We apologize for any inconvenience.
1.   On Aug. 28, 2014, the University of Maryland A. James Clark School of Engineering hosted an Advanced Transportation Technologies Day open house to showcase its development on transportation. Traffic Safety and Operations Lab showed its progress on several topics including UAID, dilemma zone, VSL, integrated signal control, evacuation system and eastern-shore traffic management system.
2.   Saed Rahwanji and Minseok Kim was presenting on Alternative Intersections and Interchanges Symposium 2014 in Salt Lake City, Utah. The title was "State of the Practice, Case Studies and Analysis Tools on Unconventional Intersection & Interchange Designs in Maryland". This presentation can be found here .
3.   Xianfeng Yang and Yao Cheng was presenting on Alternative Intersections and Interchanges Symposium 2014 in Salt Lake City, Utah. Their presentations introduced the research on DDI and Superstreet as well as MUID software. This symposium explored a wide variety of newer intersection and interchange configurations. The presentations on AIIS can be found here .
4.   Saed Rahwanji was a guest lecturer at the University of Maryland for the class course of TRANSPORTATION ENGINEERING AND PLANNING on April 11, 2014. His presentation included traffic engineering operational and design concepts, Manual on Uniform Traffic Control Device and transportation engineering technologies.
5.   In view of the increasing interest on variable speed control (VSL), Dr. Chang on behalf of ATTAP team offered a VSL seminar at OOTS on April 30 for all TDSD staffs and engineers. The seminar focused on the core concept of VSL bottleneck and link-based controls, introducing the state of the practices on VSL in US and other countries. Some potential locations for VSL applications in MD were discussed.
6.   Woon Kim successfully finished and received her Ph.D. degree. The thesis title is "Development of a Traffic Incident Management System for Contending with Non-recurrent Highway Congestion".
7.   Office of Traffic & Safety - Maryland State Highway Administration (MDSHA) held a workshop on 12/12/2013 to present Maryland Unconventional Intersection Design (MUID) to MDSHA highway engineers and planners. The Applied Technology & Traffic Analysis Program (ATTAP) team (Saed Rahwanji, Minseok Kim, Sung Yoon Park, and Hyeonmi Kim) prepared and presented the workshop. This workshop consists of three sessions. The first session introduces the general concept of the Unconventional Intersection Designs. The second session focuses on the Unconventional intersection/interchange designs which are popular in Maryland including Superstreet/Maryland J-turn, Continuous Flow Intersection (CFI), Continuous Green-T intersection, Diverging Diamond Interchange (DDI), Single Point Urban Interchange (SPUI), and Double Roundabout Interchange. This session discusses advantages, disadvantages, locations, and considerations of design and operation. The last session contains case studies on the signalized Superstreet of MD 3 @ Waugh Chapel Road, DDI of MD 295 @ Arundel Mills Blvd, and CFI T-intersection of MD 200 @ US 1. The last session also has an introduction to Unconventional intersection design analysis software, MIDCAP (Maryland Intersection Design & Capacity Analysis Program) and MUID (Maryland Unconventional Intersection Designs), with hands-on practices.
8.   4 papers from ATTAP members have been accepted for 93rd TRB annual meeting.
9.   Sae’d Rahwanji presented the Applied Technology and Traffic Analysis Program (ATTAP) to several delegations visiting Maryland State Highway from Germany, Brazil and Japan. The presentations covered the program’s activities and focused on the Unconventional/Innovative Interchange and intersection designs. The ATTAP website contains many of the designs discussed with the appropriate simulation animations and concept descriptions with references to several traffic engineering analysis programming applications underway.
10.   Dr. Gang-Len Chang's Traffic Safety and Operations Center has recently been awarded a project of $542,778 over a period of 18 months to design and operate an Advanced Incident Response System for the Eastern Shore region. This project, sponsored jointly by FHWA/MDSHA, is an extension of Dr. Chang's Intelligent Transportation System research over the past 10 years on Ocean City and Eastern Shore. The focus of this phase is to provide the estimated traffic delay and duration due to a detected incident, including the predicted travel time during incident clearance operations, the criteria and models to guide any necessary detour operation, and the resulting time-varying traffic impact to both motorists and the entire region. The results of this research will be integrated with Dr. Chang's other $1.5 million on-going projects (http://www.oceancity.umd.edu) to develop a test bed for advanced traffic management systems for Maryland State Highway Administration.
11.   MDQI (Maryland Quality Initiative) presentation on "National Prespective on Diverging Diamond Interchange" is available. Click here for more information




Program Managers

Professor Gang-Len Chang

Dept. of Civil & Environmental Engineering

Univ. of Maryland - College Park

Email: gang@umd.edu


Saed Rahwanji, Assistant Division Chief

Traffic Development & Support Division

Office of Traffic and Safety

Maryland State Highway Administration

Email: srahwanji@sha.state.md.us  


Minseok Kim, ATTAP Team Leader

Traffic Development & Support Division

Office o Traffic and Safety

Maryland State Highway Administration

Email: MKim@sha.state.md.us  


Program Advisor

Cedric Ward, Director

Office of Traffic and Safety

Maryland State Highway Administration

Email: CWard@sha.state.md.us

(Complete List)         (Visitors)






Research Areas

  • Traffic control and operations
  • Traffic simulation modeling
  • Travel time estimation and prediction system
  • Real-time traffic monitoring and emergency evacuation
  • Traffic safety analysis and evaluation
  • Intelligent transportation systems
  • Innovative highway geometric design and simulation


Quick link to:

  • Eastern Shore Traffic Monitoring System
  • Taiwan Route 5 Traffic Monitoring System
  •   In ATTAP

    What's New

    Tour Guide to ATTAP

    Introduction to MIDCAP and MUID

    Advanced Transportation Technologies Day Presentation--

     Eastern Shore Traffic Management System

    Advanced Transportation Technologies Day Presentation--

     Baltimore Evacuation System

    Advanced Transportation Technologies Day Presentation--

     Real Time Control

    Advanced Transportation Technologies Day Presentation--


    Advanced Transportation Technologies Day Presentation--

     Dilemma Zone

    Advanced Transportation Technologies Day Presentation--


    Presentation on AIIS 2014 - Design and performance Evaluation for Superstreet intersections


    Presentation on AIIS 2014 - MUID:A Design and Evaluation Tool for Alternative Intersections


    Presentation on AIIS 2014 - Development of a Multi-stage Design System for Diverging Diamond Interchange


     Effect of Short  

     Left-turn Bay on

     Intersection Capacity by Yukai Huang

     Lane Use Factor  

     for Lane Drop by Yukai Huang

     Development of a Traffic  

     Incident Management

     System for Contending with
     Non-recurrent Highway
     dissertation by Woon Kim

     MUID Course  

     December 12 2013
     @ MDSHA

     ATTAP Progress Meeting  

     August 28 2013
     @ MDSHA

     The story behind Maryland's  

     first DDI @ MDQI meeting

     (Maryland Quality Initiative)

     National Perspective  

     on DDI @ MDQI meeting

     (Maryland Quality Initiative)

     Baltimore On-line  

     Simulation Tool

     Baltimore Off-line  

     Simulation Tool

     Eastern Shore Regional  

     Traffic Monitoring and
     Management System

     Development of a Mixed-  

     flow Optimization System

     for Emergency
     Evacuation Network
     Dissertation by Xin Zhang

     US 40 at Red Toad  Rd.

     Dilemma Zone Protection

     System Evaluation

     MDQI: Maryland Unconventional

     Intersection Design (MUID)

     Presentation by ATTAP

     MDQI: Field Evaluation

     of Double Crossover

     Diamond Interchange (DDI) by Wei Zhang (FHWA)

     MDQI: MD 85 at I 270

     Interchange: Evolving from

     Conventional to Hybrid Unconventional Configuration

     Avijit Maji (MDSHA)

     Traffic volume data

     (Inbound/Outbound) in

     Ocean City, MD during

     hurricane Irene evacuation

     Integration of VSL with  Travel Time Information

     for recurrent

     Congestion (US DOT)

     MUID (Maryland  Unconventional



     Development of

     a Hybrid Model for

     Prediction of

     Freeway Incident Duration


     Variable Speed

     Limit Control

     System, Experimental



     Sensors keep

     cars on the move on

     the way to the beach



     TV interview

     By Discoveries

     & Breakthroughs

     Inside Science (DBIS)


     ATTAP and UAID

     programs were interviewed

     by TV station



     Framework of the I-695

     Simulation-based Traffic

     Management System



     A Region-wide

     Evacuation & Traffic

     Monitoring System



     I-270 Intelligent

     On-Line Traffic

     Management System



     Introduction to UAID





     Lane Closure Analysis

     Program (LCAP)




     Summary of research




    Updated March, 2014. Copyright ©2004-2014 ATTAP. All rights reserved.