The Future of Dynamic Traffic Assignment

November 21, 2010

Khang Nguyen addressing the DTA Workshop. Photo by Kyle Meyer

Transportation planners and engineers today are faced with complex analyses of innovative applications such as system performance, reliability, managed lanes, congestion pricing, one-way two-way conversion, construction detour, and more. Traditional analysis tools, including travel-demand modeling and microsimulation, often do not meet the analyst’s needs or the available budget. As a result, simulation-based Dynamic Traffic Assignment (DTA) has been rapidly gaining popularity and becoming the tool of choice for such applications.

On November 17th, a workshop was held at the Portland, Oregon, office of Kittelson & Associates, Inc., on this important topic. It featured Associate Transportation Modeler Peter Bosa (Portland Metro), Senior Principal Engineer Wayne Kittelson (Kittelson), & Associate Engineer Khang Nguyen (Kittelson). They led a discussion on DTA development, its state of the practice, applications, and future direction. This session also brought together experts on this topic that walked through examples of how DTA has been applied in Tucson, as well as Portland.

Use the following links to view the associated PDF version of each section of the presentation:

DTA – State of the Practice
DTA – Portland Metro – case study
DTA – Enhancing & Applying DTA Models

If you are interested in more details about this important topic, you can contact Wayne Kittelson at (800) 878-5230 or click on any of the presenters names below to email them directly. We also welcome your experience, insight, and questions. We encourage you to post a comment in the section at the end of this post.


About the Presenters


Peter Bosa
Associate Transportation Modeler, Portland Metro

Peter is a transportation modeler with Portland Metro's Transportation Research and Modeling Services program. He has over 4 years of experience in applying transportation models for regional- and corridor-level forecasting of travel behavior, air quality and vehicle emissions, and applications for the Federal Transit Administration's New Starts program. He is one of the primary developers of Metro's regional DTA network.


Khang Nguyen, PE
Associate Engineer, Kittelson & Associates, Inc., Tucson, AZ

Khang has 15 years of experience in traffic engineering, with particular expertise in capacity and operations analysis, traffic design, and freeway modeling. He is highly skilled in the use of traffic analysis tools, including Synchro/SimTraffic, CORSIM, VISSIM, DynusT, and the HCM methodologies. He's applied DynusT to model an I-10 section in Tucson and is currently leading a CORSIM team to model the Golden Glades Interchange, aka Spaghetti Bowl, in Miami, Florida. Khang holds a B.S. (Cal-Poly) degree in civil engineering and M.S. (Cal-Berkeley) degree in transportation engineering.


Wayne Kittelson, PE
Senior Principal Engineer, Kittelson & Associates, Inc., Portland, OR

Wayne is the Founding Principal of Kittelson & Associates, Inc. and offers over 35 years of both national and international experience in transportation planning, traffic engineering, highway design, public involvement, and transportation research. He serves in various leadership roles for the Transportation Research Board and is an invited member of a policy-level advisory panel for the Federal Highway Administration. He regularly teaches transportation related courses at universities around the nation and also within training programs sponsored by a number of state DOTs. He serves as the Principal Investigator for two noted SHRP2 research projects, one of which employs DTA to evaluate effects of operations, technology and design on roadway capacity.







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