ITE Journal - August 2020 - 33

Initial findings will come from surrogate and anecdotal findings,
along with crash analyses at early field implementations.
Additional public outreach could include highlighting turbo
roundabouts implemented in Europe, demonstrating their positive
impact on performance, and creating a greater sense of familiarity
with how to navigate the roundabout. These messages can
reemphasize the importance of lane selection on the approach and
the principle of no lane changing in the circulatory roadway.
As turbo roundabouts are opened throughout the United States,
it will be important to incorporate feedback from those projects
into messaging on future projects. After installation, agencies can
continue providing information on how specific user types are
intended to navigate the turbo roundabout.
Turbo roundabouts may appear different at first pass, but the
intuitive features of this intersection alternative position it for more
widespread consideration in the United States. itej

References
1.	 National Highway Traffic Safety Administration. (2019). Welcome to the
new NHTSA Query tool. Washington, D.C. https://cdan.nhtsa.gov/query
(Accessed on December 12, 2019).
2.	 Steyn, H., Griffin, A., & Rodegerdts, L. (2015). Accelerating Roundabouts in
the United States: Volume IV of VII - A Review of Fatal and Severe Injury
Crashes at Roundabouts. Report No. FHWA-SA-15-072. FHWA Office of
Safety, Washington, D.C.
3.	 Vasconcelos, L., Silva, A. B., Seco, Á. M., Fernandes, P., & Coelho, M. C. (2014).
Turbo roundabouts: multicriterion assessment of intersection capacity,
safety, and emissions. Transportation Research Record: Journal of the
Transportation Research Board, 2402(1), 28-37.
4.	 Fortuijn, L. (2009). Turbo roundabouts: Design principles and safety
performance. Transportation Research Record: Journal of the
Transportation Research Board, (2096), 16-24.
5.	 Macioszek, E. (2016). The application of HCM 2010 in the determination of
capacity of traffic lanes at turbo roundabout entries. Transport Problems, 11.
6.	 Federal Highway Administration. (2020). Informational Primer: Turbo
Roundabouts. Federal Highway Administration, Office of Safety. FHWASA-20-019.
7.	 Rodegerdts, L., Bansen, J., Tiesler, C., Knudsen, J., Myers, E., Johnson,
M., ... O'Brien, A.. (2010). Roundabouts: An Informational Guide.
Transportation Research Board, NCHRP 672, National Research Council,
Washington, DC.
8.	 Džambas, T., S. Ahac, and V. Dragčević. (2017). Geometric Design of Turbo
Roundabouts. Tehnički vjesnik, 24(1), 309-318.
9.	 Macioszek, E. (2015). The road safety at turbo roundabouts in
Poland. Archives of Transport, 33.
10.	 Schroeder, B., Rodegerdts, L., Jenior, P., Myers, E., Cunningham, C.,
Salamati, K., Searcy, S., O'Brien, S., Barlow, J., Bentzen, B.L. (2016). Crossing
Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians

with Vision Disabilities - A Guidebook. NCHRP Research Report 834,
Transportation Research Board, Washington, D.C.
11.	 Federal Highway Administration. (2020). Advancing Turbo Roundabouts
in the United States Synthesis Report. Federal Highway Administration,
Office of Safety. FHWA-SA-19-027.

R.J. Porter, Ph.D., P.E. has 20 years of experience in
performance-based planning, programming, and
design; road safety; traffic operations; safety data
systems; and user behavior. His work has resulted in
more than 80 published papers, research reports, and
practitioner guidelines documents, and many outreach presentations
in the United States and abroad.
Jeffrey Gooch, P.E. works on a mix of technical
assistance, research, and instruction in data driven
safety analysis. He received both his B.S. and M.S.
degrees in Civil Engineering from Penn State
University. He most enjoys the application of
quantitative highway safety analysis to design decisions.
Catherine Chestnutt joined VHB as a communications specialist in 2018. Through her position, she
has facilitated diverse public engagement events and
translated detailed research into technical briefs and
marketing materials for broader audiences.
Brian Moore, P.E. has focused on bike and pedestrian
projects in his 21-year career. He has been involved
with the design of roundabouts since the first one in
Ohio back in 2004. At Arcadis, he lends his expertise to
staff for the design and review of roundabouts in the
U.S. states of Ohio, Georgia, Florida, Louisiana, and Tennessee.
Jaap Tigelaar (M) was born and raised in the
Netherlands. After his masters at the Delft
University of Technology, he worked for more than
11 years at Arcadis in the Netherlands. Since
February 2019, he has worked in the Arcadis
Atlanta, GA, USA office, bringing his Dutch knowledge about
turbo roundabouts to the United States.
Jeffrey Shaw, P.E., PTOE, PTP, RSP1 (M) serves as
the Intersection Safety Program Manager for the
Federal Highway Administration, Office of Safety.
He is a registered professional engineer in Illinois
and has been board certified as a Professional
Traffic Operations Engineer and Road Safety Professional.
w w w .i t e.or g

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ITE Journal - August 2020

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