Traffic and Transportation Engineering for Modern Roundabouts

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The Impact of Geometric Factors on the Capacity of Single-Lane Roundabouts (Winner TRB 2018 Best Paper Award)

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Featured Roundabout

Holman Highway 68/Highway 1 Roundabout, Monterey, CA
MTJ provided a two roundabout solution for this vital, highly constrained interchange that is the gateway to the greater Monterey Bay area as well as Pebble Beach Golf Resort.

Featured Video

Holman Highway Roundabout
Watch a brief summary of the project.

Overcoming Public Outreach Challenges

Successful Community Education Workshop
Watch workshop highlights on addressing implementation challenges.

No-Cost Initial Consultation

“Thank you! You have done an excellent job in documenting and sending memo of findings. It exceeded our expectations on timeline and schedule. Mark Melnychenko, our Transportation Director, and Phil Kercher thank you for all your effort on this project.” Kiran Guntupalli P.E. PTOE, Principal Traffic Engineer, City of Scottsdale

“A special thank you to Mark because the updates based on his designs and suggestions really helped “turn the tide.” His involvement has had a great positive impact on the project.” Eva D. Vargas, PE, AICP, Project Engineer, City of Cleveland Mayor’s Office of Capital Projects, E&C

“It's true - the devil is in the details. We have learned the critical importance of using a true subject-matter expert when it comes to delivering optimally operating roundabout intersection control. Going to a class, owning the software, and even designing many roundabouts are not equivalent to decades of studying the sensitive, operational fine points that separate average from optimally performing roundabouts. Mark Johnson is a unique specialist with an eye for finding the subtle design nuances that can make or break roundabout performance. Whether it is in the role of original designer or peer reviewer, we trust Mark and his team to bring the knowledge, experience, and input necessary to assure our roundabouts are delivered at the highest level.” Gregory P Muhonen, PE, Public Works Director, Town of Estes Park, CO

“It was wonderful working with you on this project and it was a pleasure working with you on a unique project such as this (Not too often we cut back lanes in a recently built roundabout). We don’t tend to build too many roundabouts, but when we do, I certainly will recommend they reach out to you for discussing future work. We greatly appreciate MTJ Engineering and the work provided on this project! I highly recommend MTJ!” Josh Potter, Transportation Engineer, Hennepin County Public Works – Design

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