graphical image of female's profile with traffic symbols surrounding her head

Session No. 1D

Session Title: Roundabouts & Innovative Intersections/Interchanges

Session Description: This session will be focusing on how Next Gen Transportation designs are contributing to the planning, design and implementation of the innovative interchanges and intersections. Specifically, this session will focus on how operations and geometrics work together for consistent innovative design; referencing current national best design practices and lessons learned regarding the refinement of innovative designs.

Moderator: Michael P. Mastaglio, PE, PTOE, Urban Engineers

The Relationship between Geometry and Traffic Operations (Why Innovative Interchanges Work and How you Can Use the Theories for Every Day Design Too), Gilbert Chlewicki, PE, Director, Advanced Transportation Solutions

Multilane Roundabouts – Rightsizing and Phased Implementation, Andrew Thompson, EIT, Project Engineer, Urban Engineers

Mini-Roundabouts/Maximum Benefits, Jeff Stratmeyer, P.E., Chief Engineer, Harford County DPW, Division of Highways, and Cheryl Banigan, Chief, Traffic & Transportation Planning, Harford County DPW, Division of Highways

FHWA Roundabout Guide Update, Pete Jenior, Senior Engineer, Kittelson & Associates, Inc.

Speaker Bios

Gil Chlewicki is an internationally recognized expert and leader on DDIs and other innovative intersections and interchanges. Chlewicki introduced the DDI concept to the transportation world in 2003 and has studied, developed, and designed DDIs for nearly 20 years, along with other innovative geometric designs. He has given presentations and workshops, as well as assisted on DDI and other innovative designs in nearly every US state, Canada, Australia, and several European countries. This does not include other assistance that he has provided unknowingly through his website divergingdiamond.com. He has won two national awards for Best Papers/Presentations which were entitled: Lessons Learned from 6 Operational DDIs in the US and Improving Pedestrian Operations at Innovative Geometric Designs. Within the Transportation Research Board, Chlewicki leads the Alternative Intersection Work Group and is Co-Chair of the Intersection Joint Subcommittee which has six parent TRB committees. Chlewicki is the Director of Advanced Transportation Solutions, which is based near Baltimore, Maryland. He is a very frequent visitor throughout the Commonwealth of Pennsylvania.

Andrew Thompson is a traffic engineer with Urban Engineers in their Philadelphia Office. Through this role he has been designing trails, roads, and roundabouts. A large focus of his career has been the development of roundabout best practices from planning through design. Thompson has provided roundabout services to the City of Philadelphia and the Commonwealth of Pennsylvania through local and statewide programs. He is a member of ASCE and the Institute of Transportation Engineers, Mid-Atlantic Section (MASITE).

Jeff Stratmeyer is a 1986 graduate of the University of Delaware and has been employed by Harford County Government for the past 28 years. He was the County’s Traffic Engineer for the first 10 years and has been the Chief Engineer for Roads and Bridges since 2000.  Stratmeyer was instrumental in creating the County’s Adequate Public Facilities Law for roads, the creation of the County’s traffic calming program and has been involved in the design/construction of over 40 major road and bridge projects throughout Harford County. He is passionate about traffic safety and is most proud of the improvements that have been made to the County’s road system to improve safety over the past 25 years. Stratmeyer has been married to his wife, June, for 31 years and has a 30-year-old son (also a civil engineer working for JMT) and a 27-year-old daughter and son-in-law. In his spare time, he enjoys spending time with his wife while travelling, playing golf, and riding their 1992 Honda Goldwing.

Cheryl Banigan is Penn Stater and had worked for the Department of the Army and two consulting firms before joining Harford County Government, where she has worked for 29 years. She worked as a design engineer and became the Traffic Engineer, when Stratmeyer took over as Chief Engineer. Banigan also worked on creating the Adequate Public Facilities laws, the traffic calming program, and created the Adopt-A-Roundabout program. Additionally, she works with the Planning and Zoning Department on long range planning. She reviews all traffic studies required for new developments and works on studies for various corridors in the county. She also conducts all of the studies for traffic calming requests.  Banigan has two daughters, a son-in-law and two grandchildren. In her spare time, she enjoys going to or watching Penn State football games and working on her bucket list.

Pete Jenior is a Senior Engineer with Kittelson & Associates, Inc. in Baltimore. He manages Kittelson’s open-end roundabout support contract with PennDOT, has instructed numerous three-day roundabout design workshops for PennDOT, and is a member of the NCHRP 3-130 team that is currently developing an update to the 2nd Edition of the FHWA Roundabout Guide (NCHRP Report 672).



The Transportation Engineering and Safety Conference (TESC) attracts professionals from throughout Pennsylvania, the mid-Atlantic region, and the country. It is an authoritative source of information on pressing issues from some of the foremost experts in transportation today.

Thomas D. Larson Pennsylvania Transportation Institute

201 Transportation Research Building

The Pennsylvania State University

University Park, PA 16802-4710

Phone: 814-865-1891