Transportation Research Board

“Scott Ritchie is the nation’s leading roundabout design specialist recognized as a modernizer of the transportation industry, a qualified roundabout design expert and instructor, public educational speaker, and established publisher of roundabout design guidelines in the U.S.” – TRB

Arizona Dept. of Transportation

“Scott Ritchie [RTE] is simply the best roundabout designer in the business.” – ADOT

California Dept. of Transportation

“This is a roundabout design solution that quite frankly is in a class by itself.  In a simple, yet paradoxically profound way, Scott Ritchie managed to take this problematic corridor on a journey that begins with sound design principles and ends with an operational work of art.” – Caltrans

Wisconsin Dept. of Transportation

“Mr. Ritchie’s inherent knowledge of working traffic operations, extensive field research, innovative transportation solutions, contributions with publications and agency guides, and demonstrated ability to understand and design complex projects from a holistic approach has made him an unsurpassed leader in his field.”  – WisDOT

Institute of Transportation Engineers

“Scott Ritchie has devoted his entire career to pioneering the roundabout revolution in North America.” – ITE

Federal Highway Administration

“Mr. Ritchie has developed innovative design techniques to substantially improve modern roundabout operations and field safety.  Scott is one of our national Peer Reviewers… and focuses on roundabout corridor sustainability with enhanced multi-modal facilities.” – FHWA


RTE doesn’t need to think outside the box, we know there is no box!  

The State of Alaska Department of Transportation and Public Facilities (DOT&PF) completed a Highway Safety Improvement Program (HSIP) project at the Danby Street and Wembley Avenue intersection (Danby-Wembley) in Fairbanks, Alaska.  The Alaska DOT&PF has adopted a “Roundabout First” policy and give this project resounding praise to the tune of featuring RTE’s projects in their roundaobut informational video.  The objective of this project was to upgrade the existing two-way stop controlled intersection with a modern roundabout in an effort to improve safety for all corridor and intersection users – especially for extreme OSOW truck traffic. During extensive truck trials in the field, large trucks with different configurations tested the roundabout design to make sure they can easily pass through RTE’s design layout.   Mr. Ritchie creatively developed unique design treatments to allow a few excessibly long special permit OSOW trucks to traverse the roundabout backwards and through islands in order to maintain safety for all other road users.  That’s not just thinking outside the box, but realizing there is no box! 




“This is the most complex roundabout project in the nation where only one designer could have actually pulled it off.”  – FHWA

This state-of-the-art roundabout project consisting of five multi-lane roundabouts in an urban corridor included high traffic volumes (55k ADT), horizontal ROW and vertical grade constraints within the commercial business area, and requirements for STAA trucks to stay “in-lane” through each of the closely spaced multi-lane roundabouts.  RTE is extremely proud of this design project as it validates the design flexibility of roundabouts.  It not only converts five highly congested existing traffic signals to modern roundabouts for improved capacity and safety, but it also costs $10M less compared to other alternatives while preserving businesses.



Truck INterchange

We must keep our freight industry rolling and allow trucks to navigate through modern roundabouts safely without encroaching into adjacent travel lanes.

This is a multi-lane roundabout (MLR) interchange project with accompanying roundabouts on either side (4 MLRs total).  The parallel roadway to the east of the interchange experienced high volumes to/from the freeway ramps with reversing flows in the peak hours.  This required multi-lane approaches for nearly every leg of each roundabout (dual lefts, dual through lanes, and bypass lanes) to accommodate the business district to the east.  In addition, the industrial district to the west (left) required OSOW trucks in excess of 200 feet long to traverse the roundabouts.  This required special design techniques to accommodate such excessively long trucks. 

  The west roundabout has a gated truck only path through the center of the roundabout for OSOW trucks.  RTE witnessed the construciton of this project in 2012 (Interstate 41 / CTH F  (Scheurring Way) in Brown County, Wisconsin).   


This is one of the projects inspired the USDOT and several state DOTs to have RTE develop the nationwide truck study completed in 2012 – Joint Roundabout Truck Study.  This study not only proved how well trucks staying in lane can function for safety and capacity, but led to an instrumental change in roundabouts in the USA.