The President of RTE, Scott Ritchie, P.E., has been involved in the evaluation, design, modification, audit, redesign, and presentation of many roundabouts throughout the United States. As a roundabout specialist, Mr. Ritchie has been involved with several roundabout publications, taught many educational roundabout design courses throughout the United States, and is viewed as a leader in the industry capable of handling and conveying expert modern roundabout design theory and practices.

Mr. Ritchie has many years of experience working in the traffic engineering industry on a variety of projects for private and public clients. He has developed a specialized interest in roundabout research, design, and evaluation in parallel with his traffic and transportation engineering disciplines.

Please contact us to request a List of Recent Projects, Firm Description, Qualification information, and/or a Resume.
*Full Design = roundabout and traffic related work only and does not represent civil engineering or full completion of PS&E / FinalPlans.
C Street / O-Malley Diamond Interchange (2)
Anchorage, Alaska
PD, DR
Built/Open (2)
Roundabout Design Specialist responsible for producing geometric design assistance for prime civil, capacity analyses, and striping for a new grade separated interchange with two 2-lane roundabouts with bypass lanes. RTE designed and re-designed the interchange to properly account for capacity requirements, roundabout safety, size and lane configuration of both multilane roundabouts at this interchange project. Special design constraints involved a 120-foot truck and large trucking company near the south intersection. This interchange project was part of a much larger project of constructing a new grade separated freeway.
96th Street / Cholla
Scottsdale, Arizona
PD, DR
Built/Open
Roundabout Design Specialist responsible for producing initial geometric design and striping as well as coordination with the City for several single lane roundabouts along the 96th Street Corridor. The roundabouts along this corridor were able to replace the existing stop control at these intersections. The City was so pleased with the constructed roundabouts along this corridor that the 108th Avenue Corridor Project commenced with roundabouts as well, which contained tight existing right-of-way constraints with the developed community.
96th Street / Sweetwater
Scottsdale, Arizona
PD, DR
Built/Open
Roundabout Design Specialist responsible for producing initial geometric design and striping as well as coordination with the City for several single lane roundabouts along the 96th Street Corridor. The roundabouts along this corridor were able to replace the existing stop control at these intersections. The City was so pleased with the constructed roundabouts along this corridor that the 108th Avenue Corridor Project commenced with roundabouts as well, which contained tight existing right-of-way constraints with the developed community.

Visit scottsdaletraffic.com for a live streaming webcam of this roundabout in operation.
99th Avenue / Lower Buckeye Rd
Phoenix, Arizona
FD, DR, L
Built/2007
Roundabout Design Specialist responsible for producing all geometric design, striping, and feasibility analyses for the redesign of an existing roundabout functioning as a single lane roundabout to a two lane roundabout in order to accommodate future traffic flows and adjacent developments. In the short term, the City also requested RTE to redesign the existing roundabout without making major changes to save on current costs. RTE redesigned the existing roundabout functioning as a single lane roundabout to an ultimate higher capacity 2-lane roundabout while also reducing the overall diameter and right of way requirements of the intersection and providing greatly needed safety aspects in the design or the City of Phoenix. However, the short-term design modifications RTE produced for the existing roundabout substantially reduced the overall construction costs and will continue to work well into design year 2010.
108th Street / Cactus Rd
Scottsdale, Arizona
FD, DR
Built/Open
Roundabout Design Specialist responsible for producing initial geometric design and striping as well as coordination with the City for several single lane roundabouts along the 96th Street Corridor. The roundabouts along this corridor were able to replace the existing stop control at these intersections. The City was so pleased with the constructed roundabouts along this corridor that the 108th Avenue Corridor Project commenced with roundabouts as well, which contained tight existing right-of-way constraints with the developed community.
Avenue E / Federal & State Port Of Entries
San Luis, Arizona
FD, DR, L
Built/Open
Azurite Way / Gold Strike Street
Casa Grande, Arizona
FD, DR, L
2008
Cotton Lane / Estrella Parkway
Goodyear, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, landscaping, lighting, construction materials, feasibility analyses/report, and coordination with lead civil / local jurisdictions for this high capacity 3-lane roundabout (interim 2-lane design). RTE designed an ultimate 3-lane roundabout for this intersection with four legs for future conditions. Based on the ultimate design, RTE modified the 3-lane design for 3 legs with 2-lane approaches and multiple bypass lanes in order to account for an interim design condition for this high capacity urban roundabout. The design challenge was to provide the best interim and ultimate designs with the least amount of reconstruction costs for the multiple jurisdictions involved. Coordination with the City of Goodyear, Maricopa County, and other consultants were required to process the roundabout. This roundabout was a portion of a larder roadway and bridge project over the Gila River.
Cotton Lane / Road A
Goodyear, Arizona
FD, DR, L
Built/Open
Estrella Parkway / Calistoga Parkway
Goodyear, Arizona
FD, DR, L
Built/Open
Estrella Parkway / Cotton Lane (South)
Goodyear, Arizona
FD, DR, L
Built/Open
Estrella Parkway / Jim King Sr. Blvd.
Goodyear, Arizona
FD, DR, L
Built/Open
Granite Dells Parkway / Dells Ranch Road
Prescott, Arizona
FD, DR, L
Built/Open
I-17 / J.W. Powell Blvd Interchange (2)
Flagstaff, Arizona
DR
2010
I-17 / Middle Verde Rd Interchange (2)
Camp Verde, Arizona
PD, DR, L
Built/Open
I-17 / SR 69 / Cordes Lakes Road Interchange
Cordes Lakes, Arizona
FD, DR, L
2010
I-17 / SR 69 Interchange
Cordes Lakes, Arizona
FD, DR, L
2010
I-19 / Canoa Ranch Road Interchange
Green Valley, Arizona
DR
Built/Open
I-40 / Twin Arrows Interchange
Flagstaff, Arizona
FD, DR, L
2010
I-202 / Brown Rd Diamond Interchange (2)
Mesa, Arizona
Built/Open
Roundabout Design Engineer for the signing of two new roundabout diamond interchanges at Interstate Loop 202/Brown Road and Interstate Loop 202/KcKellips Road for ADOT in Arizona. During the signing design, Mr. Ritchie introduced a new signing methodology for roundabouts developed from British practices and converted to US and MUTCD standards where applicable since no signing standards exist for US roundabouts.
I-202 / McKellips Rd Diamond Interchange (2)
Mesa, Arizona
Built/Open
Roundabout Design Engineer for the signing of two new roundabout diamond interchanges at Interstate Loop 202/Brown Road and Interstate Loop 202/KcKellips Road for ADOT in Arizona. During the signing design, Mr. Ritchie introduced a new signing methodology for roundabouts developed from British practices and converted to US and MUTCD standards where applicable since no signing standards exist for US roundabouts.
Prescott Lakes Parkway / Sundog Connector Roadway
Prescott, Arizona
FD, DR, L
2008/2009
Prescott Lakes Parkway / Sundog Ranch Road
Prescott, Arizona
FD, DR, L
2008/2009
Road 27 / Road 37
Prescott, Arizona
PD, DR
2010
SR 64 (Tusayan St) / Coyote Lane
Tusayan / Grand Canyon, Arizona
FD, DR, L
2011
SR 64 (Tusayan St) / S. Long Jim Loop Rd
Tusayan / Grand Canyon, Arizona
FD, DR, L
2011
SR 79 / SR 79B
Florence, Arizona
FD, DR, L
2011
SR 87 / Airport Rd / Airline Rd
Payson, Arizona
FD, DR, L
Under Construction
SR 87 / Tyler Parkway
Payson, Arizona
PD, DR
Built/Open
SR 89 / Centerpointe South (Del Rio Rbts)
Chino Valley, Arizona
PD, DR
2008
SR 89 / Haul Road
Page, Arizona
FD, L
Under Construction
Roundabout Design Specialist responsible for producing geometric design, striping, and feasibility analyses for the design of a large diameter roundabout in order to accommodate extraordinarily large trucks hauling houseboats to Lake Powell along a high speed rural state highway. Due to the massive length, height, and width of the trucks hauling houseboats to and from Lake Powell multiple times a day, a traffic signal could not function without removing the signal heads and mast arms. Hence, RTE designed the roundabout to accommodate the high speeds of SR 89 as well as the large trucks providing the community with revenue. The resulting roundabout is 200 feet in diameter with a large truck apron that was tested in the field prior to any construction with extremely positive results.
SR 89 / Road 4 South
Chino Valley, Arizona
DR
Built/Open
SR 89 / Ruger Road
Prescott, Arizona
FD, DR, L
2008/2009
SR 89 / Side Road Connector
Prescott, Arizona
FD, DR, L
Under Construction
SR 89 / Willow Lake Road
Prescott, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with the lead civil, ADOT, and the City of Prescott for this high capacity, high speed 3-lane roundabout (interim 2-lane design currently built).

This modern roundabout is the first intersection in the State of Arizona to replace a traffic signal.

The roundabout design has had no reported injury accidents in two years of operation, which significantly improved the original signal's 24 accidents in its last 3-years. The design challenge was to provide the best 2-lane interim design with easy conversion to a 3-lane ultimate design with the least amount of reconstruction costs for the multiple jurisdictions involved. Coordination with ADOT, the City of Prescott, and other consultants were required to process the roundabout.
SR 89A / Brewer Rd
Sedona, Arizona
DR
Built/Open
SR 89A / J.W. Powell Blvd
Flagstaff, Arizona
DR
2010
SR 89A / Lisa Street - Lincoln Drive
Clarkdale, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all horizontal geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with the lead civil, ADOT, and the local jurisdictions for this high capacity corridor of five closely spaced multi-lane roundabouts in Clarkdale and Cottonwood, Arizona.

These five modern roundabouts are the first multi-lane roundabouts in the State of Arizona to be completed as a corridor of roundabout designs with close intersection spacing.

Each of the five roundabouts along this corridor had two-lanes approaching on SR 89A in each direction. The SR 89A / Black Hills Drive / North Verde Heights Drive roundabout required a dual left on Verde Heights Drive as well. All five roundabouts required specific truck movements, access control and access management to existing and future commercial properties. This roundabout is one example of five roundabouts spaced from 1/4 mile to 3/4 mile apart along the SR 89A corridor with RTE.
SR 89A / Old Main Street / Cement Plant Rd
Clarkdale, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all horizontal geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with the lead civil, ADOT, and the local jurisdictions for this high capacity corridor of five closely spaced multi-lane roundabouts in Clarkdale and Cottonwood, Arizona.

These five modern roundabouts are the first multi-lane roundabouts in the State of Arizona to be completed as a corridor of roundabout designs with close intersection spacing.

Each of the five roundabouts along this corridor had two-lanes approaching on SR 89A in each direction. The SR 89A / Black Hills Drive / North Verde Heights Drive roundabout required a dual left on Verde Heights Drive as well. All five roundabouts required specific truck movements, access control and access management to existing and future commercial properties. This roundabout is one example of five roundabouts spaced from 1/4 mile to 3/4 mile apart along the SR 89A corridor with RTE.
SR 89A / Scenic Drive - W Groseta Ranch Rd
Clarkdale, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all horizontal geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with the lead civil, ADOT, and the local jurisdictions for this high capacity corridor of five closely spaced multi-lane roundabouts in Clarkdale and Cottonwood, Arizona.

These five modern roundabouts are the first multi-lane roundabouts in the State of Arizona to be completed as a corridor of roundabout designs with close intersection spacing.

Each of the five roundabouts along this corridor had two-lanes approaching on SR 89A in each direction. The SR 89A / Black Hills Drive / North Verde Heights Drive roundabout required a dual left on Verde Heights Drive as well. All five roundabouts required specific truck movements, access control and access management to existing and future commercial properties. This roundabout is one example of five roundabouts spaced from 1/4 mile to 3/4 mile apart along the SR 89A corridor with RTE.
SR 89A / Side Road Interchange (2)
Prescott, Arizona
FD, DR, L
Under Construction
SR 89A / Valley View Rd - Avenida Centerville
Clarkdale, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all horizontal geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with the lead civil, ADOT, and the local jurisdictions for this high capacity corridor of five closely spaced multi-lane roundabouts in Clarkdale and Cottonwood, Arizona.

These five modern roundabouts are the first multi-lane roundabouts in the State of Arizona to be completed as a corridor of roundabout designs with close intersection spacing.

Each of the five roundabouts along this corridor had two-lanes approaching on SR 89A in each direction. The SR 89A / Black Hills Drive / North Verde Heights Drive roundabout required a dual left on Verde Heights Drive as well. All five roundabouts required specific truck movements, access control and access management to existing and future commercial properties. This roundabout is one example of five roundabouts spaced from 1/4 mile to 3/4 mile apart along the SR 89A corridor with RTE.
SR 89A / W Black Hills Dr - N Verde Heights Dr
Clarkdale, Arizona
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all horizontal geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with the lead civil, ADOT, and the local jurisdictions for this high capacity corridor of five closely spaced multi-lane roundabouts in Clarkdale and Cottonwood, Arizona.

These five modern roundabouts are the first multi-lane roundabouts in the State of Arizona to be completed as a corridor of roundabout designs with close intersection spacing.

Each of the five roundabouts along this corridor had two-lanes approaching on SR 89A in each direction. The SR 89A / Black Hills Drive / North Verde Heights Drive roundabout required a dual left on Verde Heights Drive as well. All five roundabouts required specific truck movements, access control and access management to existing and future commercial properties. This roundabout is one example of five roundabouts spaced from 1/4 mile to 3/4 mile apart along the SR 89A corridor with RTE.
SR 89A NB / Granite Dells Parkway Interchange
Prescott, Arizona
FD, DR, L
Under Construction
SR 89A SB / Granite Dells Parkway Interchange
Prescott, Arizona
FD, DR, L
Under Construction
SR 179 / Arrow Rd
Sedona, Arizona
DR
Under Construction
SR 179 / Back O' Beyond Rd
Sedona, Arizona
DR
Built/Open
SR 179 / Bell Rock Blvd
Sedona, Arizona
DR
Built/Open
SR 179 / Chapel Rd
Sedona, Arizona
DR
Under Construction
SR 179 / Ridge Trail
Sedona, Arizona
DR
Built/Open
SR 179 / SR 89A
Sedona, Arizona
DR
Built/Open
SR 179 / Verde Valley School Rd
Sedona, Arizona
DR
Built/Open
SR 260 / Mud Springs Road
Payson, Arizona
FD, DR, L
2010
US 60 / US 93 / Wickenburg Way
Wickenburg, Arizona
FD, DR, L
Under Construction
US 60 / Vicksburg Road
Vicksburg, Arizona
DR
Under Construction
US 93 / SR 89
Wickenburg, Arizona
FD, DR, L
2012
US 93 / Tegner Street
Wickenburg, Arizona
FD, DR, L
Under Construction
US 93 / Vulture Mine Road
Wickenburg, Arizona
FD, DR, L
2012
US 191 / SR 264
Granado, Arizona
FD, DR, L
Under Construction
Roundabout Design Specialist responsible for producing all horizontal geometric design, striping, signing, landscaping, lighting, construction materials and vertical design assistance with ADOT for a high speed elliptical roundabout in a rural area adjacent to a high school, restaurant, gas station, and residential subdivisions. RTE designed the unique shape to account for the acute angles or skew of the intersection as well as the high speed approaches.

This modern roundabout is the first elliptical roundabout design in the State of Arizona.
Willow Creek Road / Park West
Prescott, Arizona
FD, DR, L
2008/2009
Woody Mountain Rd / El Presidio Drive
Flagstaff, Arizona
FD, DR, L
2009
Yuma Road / Durango Street
Buckeye, Arizona
FD, DR, L
Built/Open
Arkansas Systems Road / Kirk Road
Little Rock, Arkansas
FD, DR, L
Built/Open
8th Avenue / Greenwich Drive
Chico, California
DR, L
Built/Open
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
8th Avenue / Magnolia Avenue
Chico, California
DR, L
Built/Open
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
8th Avenue / Meadow Road
Chico, California
DR, L
Built/Open
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
8th Street / El Monte Avenue Mini Rbt
Chico, California
FD, DR, L
2008
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
8th Street / Forest Avenue Mini Rbt
Chico, California
FD, DR, L
2008
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
8th Street / Kern Street Mini Rbt
Chico, California
FD, DR, L
2008
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Beach Street / Pacific Avenue
Santa Cruz, California
FD, DR, L
Under Construction
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, lighting, construction materials, and coordination with City and public for this unique four-leg single lane roundabout. A railroad crossing, tight right-of-way constraints, extremely high pedestrian/cyclist volumes, special truck considerations onto the Wharf Pier, tollbooths on the pier, parking, and one-way exits were incorporated into this design. This project is located at the Fisherman's Wharf pier adjacent to the Boardwalk Theme Park in downtown Santa Cruz. The Union Pacific Railroad Tracks are used twice a day that traverse through the roundabout. The pedestrian and cyclist counts rivaled the future traffic design volumes for the intersection due to the nearby theme park, shopping, and main beach area for the City. In addition, there are tollbooths located on the pier (south leg of roundabout) that would create failure for a traffic signal coupled with the railroad.
Brisco Road / Branch Street
Arroyo Grande, California
FD, DR
Built/Open
Brisco Road / El Camino Real
Arroyo Grande, California
FD, DR
Built/Open
Brockway Road / Martis Drive
Truckee, California
PD
Built/Open
Bruce Road / State Route 32
Chico, California
PD
2008
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Brunswick Road / Idaho Maryland Road
Grass Valley, California
PD
2010
Burnap Avenue / Eaton Road
Chico, California
FD, DR, L
2007
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Center Street / Pacific Avenue
Santa Cruz, California
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, lighting, construction materials, and coordination with City and public for this unique four-leg single lane roundabout. Tight right-of-way constraints, vertical constraints, high pedestrian/cyclist volumes, special landscaping parameters, and multiple one-way exits were incorporated into this design.
Club Center Drive / Kokomo Drive
Sacramento, California
DR
Built/Open
College Park Road / A Street
Palmdale, California
FD, DR, L
College Park Road / I Street
Palmdale, California
FD, DR, L
Built/Open
College Park Road / Z Street
Palmdale, California
FD, DR, L
Built/Open
C Street / F Street
Palmdale, California
FD, DR, L
Built/Open
Danuba Avenue / Buttonwillow Avenue
Reedley, California
DR
2009
Donner Pass Road / Church Street
Truckee, California
PD, L
Donner Pass Road / Donner Pass Road Extension
Truckee, California
PD, L
Donner Pass Road / Glenshire Drive
Truckee, California
PD, L
Donner Pass Road / Kiser Street
Truckee, California
PD, L
Donner Pass Road / PSC
Truckee, California
PD, DR
Godman Avenue / Eaton Road
Chico, California
FD, DR, L
2007
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
I-5 / CR 8 / CR89B / Bird Creek Road
Dunnigan, California
FD, DR
Built/Open
Roundabout Design Specialist Scott Ritchie was responsible for producing a conceptual geometric design and striping of this rural roundabout directly adjacent to Interstate 5 ramps in Dunnigan, CA. Truck percentages exceeded 80% of traffic volumes with two truck stops at these ramp terminals in a rural area northwest of Sacramento, CA. Tight right-of-way constraints, high truck volumes, no pedestrians volumes, and freeway on/off ramps were components of this design.
I-80 / SR 89 South Diamond Interchange (2)
Truckee, California
PD, DR, L
Built/Open
Roundabout Design Specialist (in coordination with Barry Crown) and Reviewer responsible for initial design and design assistance of this dual roundabout diamond interchange project containing two 2-lane roundabouts with multilane entries/exits and bypass lanes onto Interstate 80. Provided signing, striping, landscaping plans, and design assistance. Please note that the actual design constructed was slightly modified by the general civil from the original plans submitted. The two roundabouts were designed as 3-lane roundabouts to accommodate future anticipated capacity requirements. Interim 2-lane roundabouts were constructed to account for short-term traffic projections and funding. The project included involvement with several jurisdictions including Caltrans Headquarters in order to obtain approval of the first roundabout interchange in California.

Click here to download a pdf version of the invitation below.
Idaho Maryland Road / E. Main Street
Green Valley, California
PD, DR
Built/Open
Roundabout Design Specialist responsible for producing and assisting with the geometric design of roundabout, capacity analyses, and striping for this partial two lane roundabout at SR 20/49. In coordination with Barry Crown, RTE redesigned this unique partial two-lane roundabout with an elliptical (oval) shape in order to avoid key ROW constraints adjacent to the intersection. The roundabout is located along urban roadways with one leg accessing SR 20/49. Coordination with the City of Grass Valley, Nevada County Transportation Commission, Caltrans, and other consultants was required to process the roundabout. This project was part of a larger project (Grass Valley Corridor Improvement Project) involving multiple interchanges and local roadway improvements/ reconfigurations.
Jacquire Road / Smith Flat Road (Gateway Rbt)
Placerville, California
FD, DR, L
Built/Open
JJJ Street / GGG Street
Palmdale, California
FD, DR, L
Built/Open
Joerger Ranch / Brockway Road
Truckee, California
PD
Lake Parkway / US 50
South Shore, California
PD
Under Construction
Roundabout Design Engineer for these unique multi-lane roundabouts. The project required extensive coordination and education to gain the acceptance of the project stakeholders including agencies such as the FHWA, Caltrans, Nevada DOT, Douglas County, City of South Shore, Casino Stakeholders, and the Tahoe Regional Planning Association. The project involved tight right-of-way constraints to maintain access to existing casinos, volumes over 60,000 ADT, high pedestrian volumes, while improving the capacity and safety of US-50.
Lancaster Blvd / 10th Street
Lancaster, California
FD, DR
2008
Longfellow Avenue / Mariposa Avenue
Chico, California
FD, DR, L
2007
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Lost Canyon / Sand Canyon
Santa Clarita, California
FD, DR, L
Built/Open
Los Valles Rd / Hasley Canyon Rd
Los Angeles, California
FD, DR, L
2007
Roundabout Design Specialist Scott Ritchie was responsible for reviewing the original roundabout design and then re-designing it to a final geometric design. This included relocating and resizing the roundabout with proper geometry, speeds, deflection, signing, striping, landscaping, lighting, construction materials, and coordination with LA County DPW. The design features extremely wide medians for the incorporation of high end landscaping for this area as well as tying into a major five lane arterial to the south of the roundabout.
Manzanita Avenue / Centennial Avenue
Chico, California
FD, DR, L
2007
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Manzanita Avenue / Chico Canyon Road
Chico, California
FD, DR, L
2007
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Manzanita Avenue / Eaton Road
Chico, California
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.

The Manzanita Avenue / Eaton Road intersection is the first multilane roundabout in North America to have a Fire Station on the roundabout itself.
Manzanita Avenue / Hooker Oak Avenue
Chico, California
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Manzanita Avenue / Vallombrosa Avenue
Chico, California
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Marguerite Parkway / La Paz Road
Mission Viejo, California
PD
Marguerite Parkway / Oso Parkway
Mission Viejo, California
PD
Marguerite Parkway / Trabuco Road
Mission Viejo, California
PD
McIver Roundabout
Truckee, California
PD
Meridian Boulevard / Majestic Pines Road
Mammoth Lakes, California
FD, DR, L
2010
Meridian Boulevard / Minaret Road
Mammoth Lakes, California
FD, DR, L
2010
Morseman Avenue / Eaton Road
Chico, California
FD, DR, L
2010
Roundabout Design Specialist responsible for assisting the City of Chico in all roundabout-related activities including internal roundabout designs, roundabout design review, roundabout technical advice with project submittals, field retrofits, signing and striping, lighting and landscaping, design assistance, policy writing review, and roundabout training. This on-call service contract with the City has included the production of many roundabouts for the jurisdiction as well as over 20 roundabouts planned for the future within the City. The example project shown is one roundabout along a corridor of nine roundabouts.
Northstar Intercept Roundabout
Placer County, California
PD
Built/Open
Old Mammoth / Minaret Road
Mammoth Lakes, California
DR
2006
Quail Valley: D Street / A Street
Palmdale, California
FD, DR, L
Built/Open
Quail Valley: S Street / HH Street
Palmdale, California
FD, DR, L
Built/Open
Quail Valley: S Street / QQ Street
Palmdale, California
FD, DR, L
Built/Open
Quail Valley: S Street / U Street
Palmdale, California
FD, DR, L
Built/Open
Quail Valley: S Street / Y Street
Palmdale, California
FD, DR, L
Built/Open
Quail Valley: Tovey Road / E Street
Palmdale, California
FD, DR, L
Built/Open
Reservation Rd (Hwy G17) / Hilo Drive
Marina, California
FD, DR
2009
Reservation Rd (Hwy G17) / Robin Drive
Marina, California
FD, DR
2009
Reservation Rd (Hwy G17) / Seaside Avenue
Marina, California
FD, DR
2009
San Juan Road / Buchman Circle
Sacramento, California
DR
Built/Open
San Juan Road / Duckhorn Drive
Sacramento, California
DR
Built/Open
Schaffer Mill Road / Lahonton Road
Truckee, California
PD
SR 28 / Bear Street
Kings Beach, California
PD
SR 28 / Coon Street
Kings Beach, California
PD
SR 89 North / Alder Drive-Prosser Dam Rd
Truckee, California
FD
Under Construction
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, landscaping, lighting, construction materials, feasibility analyses/report, high speed analyses/report, and coordination with the general civil, local jurisdiction, and Caltrans for this rural high speed single lane roundabout. RTE sole produced the roundabout design for this intersection before submittal to Caltrans and teaming with civil firm for state processing. The roundabout is located along a rural high-speed corridor within a mile of I-80 and adjacent to a local elementary school. The Town of Truckee assumed lead agency for processing the roundabouts through Caltrans.
SR 89 North / Donner Pass Road
Truckee, California
FD
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, landscaping, lighting, construction materials, feasibility analyses/report, high speed analyses/report, and coordination with the general civil, local jurisdiction, and Caltrans for this rural high speed partial two lane roundabout with bypass lanes. RTE sole produced the roundabout design for this intersection before submittal to Caltrans and teaming with the civil firm for state processing. The partial two-lane roundabout design is within a mile of Interstate 80 and has a unique design with an offset central island for the accommodation of Caltrans design vehicles, a partial single lane and partial two lane roundabout. The Town of Truckee assumed lead agency for processing the roundabouts through Caltrans.
SR 89 South / Donner Pass Road
Truckee, California
PD
SR 89 / SR 28
Tahoe City, California
PD
SR 101 / Brisco Road Interchange
Arroyo Grande, California
FD, DR
2008
SR 116 / Merabel Street
Sonoma County, California
FD, DR, L
Under Construction
SR 138 / Palmdale Blvd
Palmdale, California
FD, DR, L
Built/Open
Roundabout Design Specialist Scott Ritchie was responsible for producing all geometric design, signing, striping, lighting, landscaping, construction materials, feasibility, capacity analyses, and coordination with Caltrans District 7, Caltrans Headquarters, and the City of Palmdale for this high capacity 2-lane roundabout. Mr. Ritchie designed an ultimate 2-lane roundabout for this intersection with four legs for future conditions. Based on the ultimate design, RTE modified the ultimate design for single lane approaches and circulating lanes on the east and north legs as well as the west side of the roundabout for an interim solution to the intersection. The design challenge was to provide the best interim and ultimate designs with the least amount of reconstruction costs for the multiple jurisdictions involved. See the ultimate, interim, and design changes in the photos below.
SR 152 (Main St) / Freedom Blvd
Watsonville, California
FD, DR, L
2008
SR 168 / Auberry Road
Prather, California
FD, DR, L
Built/Open
SR 203 / Forest Trail
Mammoth Lakes, California
FD, DR, L
Built/Open
SR 203 (Main Street) / Minaret Road
Mammoth Lakes, California
FD, DR, L
2010
SR 267 / SR 28
Kings Beach, California
PD
US 50 Pioneer Trail
South Shore, California
PD
Under Construction
Roundabout Design Engineer for these unique multi-lane roundabouts. The project required extensive coordination and education to gain the acceptance of the project stakeholders including agencies such as the FHWA, Caltrans, Nevada DOT, Douglas County, City of South Shore, Casino Stakeholders, and the Tahoe Regional Planning Association. The project involved tight right-of-way constraints to maintain access to existing casinos, volumes over 60,000 ADT, high pedestrian volumes, while improving the capacity and safety of US-50.
USFS Site / Donner Pass Road
Truckee, California
FD, DR
Washington Street / Montgomery Avenue
Oroville, California
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, lighting, construction materials, construction inspection in the field, and coordination with City and public for this unique four-leg dual lane roundabout. Bridge crossings on two sides of the roundabout posed right of way constraints as well as maintaining access to local businesses (restaurants) made this roundabout design the gateway project to the City of Oroville.
Whiting Street / S. Auburn Street
Grass Valley, California
FD, DR, L
2008
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, landscaping, lighting, construction materials, and coordination with lead civil and local jurisdiction for this uniquely graded and ROW constrained single lane roundabout. RTE designed this single-lane roundabout with a specially placed and small diameter urban roundabout in order to avoid specific and closely spaced ROW constraints. Unique design principles, grading, ADA accesses, and placement of the roundabout were required in order to allow the design to fit and function. Steeper grades were designed into portions of this roundabout's circulatory roadway and approaches to fit existing site conditions. The roundabout is located mile from SR 49. Coordination with the City of Grass Valley, Nevada County Transportation Commission, and other consultants was required to process the roundabout.
29th Street / Madison Avenue
Loveland, Colorado
DR
Built/Open
88th / Rock Creek Parkway
Superior, Colorado
PD, DR
Built/Open
Airport Road / Taughenbaugh Blvd
Rifle, Colorado
PD, DR
Built/Open
Scott Ritchie designed this diamond interchange on I-70 and SR 13 with two multi-lane roundabouts at the interchange and a third roundabout closely spaced to the south of the interchange for a total of three multi-lane roundabouts in the City of Rifle, Colorado. This particular designed was located near several truck terminals which resulted in a unique design plan to accommodate a high volume of trucks that can circulate the roundabout simultaneously for specific movements. Roundabout construction begins 2005.
Cascade Avenue / 29th
Loveland, Colorado
DR
Built/Open
Centerra Lifestyle Center
Loveland, Colorado
PD, DR
Built/Open
Grace Center Roundabout
Colorado Springs, Colorado
PD, DR
Built/Open
I-70 / Airport Road Diamond Interchange (2)
Rifle, Colorado
PD, DR
Built/Open
Scott Ritchie designed this diamond interchange on I-70 and SR 13 with two multi-lane roundabouts at the interchange and a third roundabout closely spaced to the south of the interchange for a total of three multi-lane roundabouts in the City of Rifle, Colorado. This particular designed was located near several truck terminals which resulted in a unique design plan to accommodate a high volume of trucks that can circulate the roundabout simultaneously for specific movements. Roundabout construction begins 2005.
Marisol Senior Housing
Loveland, Colorado
DR
Meadow Park Drive / Market Street
Divide, Colorado
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, lighting, construction materials, and coordination with lead civil, CDOT, and local jurisdiction for this five-leg single lane roundabout. RTE designed a five-leg single lane roundabout for this intersection located 250 feet from a state highway in Divide, CO. This design imposed severe right-of-way constraints with new commercial developments and existing roadway grades to the west. The design challenge was to provide access to the nearby school, shopping centers, residential neighborhood, the state highway, and adjacent gas station while still accommodating large trucks and safety.
Midland Avenue / 27th Street Roundabout
Glenwood, Colorado
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, signing, striping, lighting, construction materials, and coordination with City and public for this custom four-leg single lane roundabout. This roundabout had an accelerated schedule under the Roaring Fork Lodge (Hotel) construction and had been in the City's planning for years. However, tight right-of-way constraints, large utility structures, steep slopes and roadway grades, large trucks, bus stops, as well as this intersection being one of only two locations providing access across the Roaring Fork River to downtown Glenwood Springs and local schools were the key issues involved with implementing this design. Local traffic congestion was beginning to create noticeable delays at the intersection, especially during school times, wherein the roundabout was proposed to alleviate the queues under present and future years. The City Engineer, Mike McDill, was excited to develop the project since others thought the roundabout would not fit within the available right-of-way.
Mountain Lion Drive (2)
Loveland, Colorado
DR
Built/Open
Mountain Shadows (6)
Arvada, Colorado
DR
Built/Open
Tutt Blvd / School Road
Colorado Springs, Colorado
FD, DR, L
Built/Open
Roundabout Design Specialist responsible for producing all geometric design, ped/bike facilities, signing, striping, lighting, construction materials, and coordination with the civil design firm for this four-leg, two-lane roundabout. Haigh Construction, their partnerships, and the City were not satisfied with the original roundabout layout by a local firm and retained RTE to produce an "optimal" roundabout design as the masterpiece of a large commercial project containing the Powers Professional Park. The design takes into account a high speed arterial roadway, a local school, adjacent building plans, and a high percentage of trucks within the available right-of-way for a comfortable roundabout operation for the public. The commercial developers and City were extremely pleased to learn this design allows for WB-67 trucks to stay in-lane in all of the approaches of the roundabout for increased safety and capacity.
Tutt Roundabouts(2)
Colorado Springs, Colorado
PD, DR
Built/Open
US 6 / Sylvan Lake Roundabout
Eagle, Colorado
PD, DR
Built/Open
US 160 / US 550 Interchange Roundabout
Durango, Colorado
FD, DR, L
2008/2009
Water Valley (2)
Windsor, Colorado
DR
Duval Rd / Airport Center Dr / River City Marketplace
Jacksonville, Florida
PD, DR
2010
Main Street / Sinclair Avenue
Tavares, Florida
DR
2010
SR 11 (N Indianapolis Rd) / Brown Street
Columbus, Indiana
PD, DR
Silver Lake Rd / Fieldcrest Rd
Green Oak Township, Michigan
FD, DR, L
2007
US 23 / Lee Rd Double Interchange (3)
Green Oak Township, Michigan
DR
Built/Open
These roundabouts were designed by Mark Johnson.
US 23 / Silver Lake Rd
Green Oak Township, Michigan
FD, DR, L
2008
US 23 / Winans Lake Rd
Green Oak Township, Michigan
FD, DR, L
2008
Whitmore Lake Rd / Winans Lake Rd
Green Oak Township, Michigan
FD, DR, L
2008
Diffley Rd (CSAH 30) / Rahn Rd
Eagon, Minnesota
DR, L
Built/Open
Founders Lane / 153rd Street
Apple Valley, Minnesota
FD, DR
Built/Open
TH 15 / North High Drive
Hutchinson, Minnesota
DR
Built/Open
TH 18 (St. Croix Trail S) / 4th Street S
Washington County, Minnesota
PD
Built/Open
TH 18 (St. Croix Trail S) / 5th Street N
Washington County, Minnesota
PD
Built/Open
TH 18 (St. Croix Trail S) / Division Street
Washington County, Minnesota
PD
Built/Open
TH 19 / Alton Ave
New Prague, Minnesota
FD, DR
Built/Open
TH 19 / Chalupsky Ave
New Prague, Minnesota
FD, DR
Built/Open
TH 19 / TH 15
New Prague, Minnesota
FD, DR
Built/Open
TH 610 / Zachery Ln Interchange (2)
Maple Grove, Minnesota
FD, DR, L
Built/Open
N 35 / Norfolk Avenue / Victory Road
Norfolk, Nebraska
PD, DR, L
Built/Open
Washington Street / N. Main Street
Rochester, New Hampshire
FD, DR
2008
International Way / Maple Island Road
Springfield, Oregon
FD, DR
2009
Marcola Road / Martin Drive
Springfield, Oregon
FD, DR, L
2010
SC 170 / SC 46
Beaufort, South Carolina
PD
Salford Road / Minimax Drive
Houston, Texas
DR
2009
Business 26 / High Road (Watertown Bypass)
Watertown, Wisconsin
DR
Under Construction
Business 26 / STH 16 EB (Watertown Bypass)
Watertown, Wisconsin
DR
Under Construction
Business 26 / STH 16 WB / Provimi Rd (Watertown Bypass)
Watertown, Wisconsin
DR
Under Construction
CTH A / East Frontage Road (Watertown Bypass)
Watertown, Wisconsin
DR
Under Construction
CTH A (Lynndale Dr) / CTH JJ (Edgewood Dr)
Appleton, Wisconsin
FD, DR
Under Construction
CTH CE / CTH HH
Outagamie County, Wisconsin
FD, DR, L
Under Construction
CTH F (Scheuring Road) / Lawrence Drive
Brown County, Wisconsin
FD, DR, L
2009
CTH F (Scheuring Road / Nimitz Road
Brown County, Wisconsin
DR
2009
CTH KB / CTH T
Village of Denmark, Wisconsin
PD
2010
CTH KR / East Frontage Rd
Paris/Somers, Wisconsin
FD, DR, L
2008
CTH KR / West Frontage Rd
Paris/Somers, Wisconsin
FD, DR, L
2008
CTH P (S Main Street) / Pleasant Valley Rd
West Bend, Wisconsin
DR
2009
CTH T / CTH GG
Winnebago, Wisconsin
PD, DR
2010
CTH T / CTH Y
Winnebago, Wisconsin
PD, DR
2010
CTH Y-existing / CTH Y-relocated (Watertown Bypass)
Watertown, Wisconsin
DR
Under Construction
CTH Y / East Frontage Road (Watertown Bypass)
Watertown, Wisconsin
DR
Under Construction
I-94 / 27th Street Interchange
Racine County, Wisconsin
DR
2009
IH-94 / CTH KR (1st Street) Interchange (2)
Paris/Somers, Wisconsin
FD, DR, L
2008
Military Avenue / Dousman Street
Green Bay, Wisconsin
PD
2010
Military Avenue / Leo Street
Green Bay, Wisconsin
PD
2010
Military Avenue / Mason Street
Green Bay, Wisconsin
PD
2010
Military Avenue / Ninth Street
Green Bay, Wisconsin
PD
2010
Military Avenue / Seventh Street
Green Bay, Wisconsin
PD
2010
Military Avenue / Shawano Avenue
Green Bay, Wisconsin
PD
2010
Military Avenue / Sixth Street
Green Bay, Wisconsin
PD
2010
Military Avenue / Western Avenue
Green Bay, Wisconsin
PD
2010
Royalton Street / STH 22 / 54 (Waupaca Bypass)
Waupaca, Wisconsin
DR
2008
STH 13 / Ann's Way
Medford, Wisconsin
DR
2009
STH 26 / CTH Y Interchange (2)
Watertown, Wisconsin
DR
Under Construction
STH 26 / STH 19 Interchange (2)
Watertown, Wisconsin
DR
Under Construction
STH 64 / 1st Street / Center Avenue
Merrill, Wisconsin
FD, DR
2009
STH 83 / CTH I
Waukesha County, Wisconsin
FD, DR
Under Construction
STH 83 / CTH X
Waukesha County, Wisconsin
FD, DR
Under Construction
STH 83 / STH 59
Waukesha County, Wisconsin
FD, DR
Under Construction
STH 178 / CTH S (Seymour Cray)
Chippewa County, Wisconsin
FD, DR, L
2009
STH 310 / CTH B
Two Rivers, Wisconsin
FD, DR
Built/Open
STH 310 / CTH Q
Two Rivers, Wisconsin
FD, DR
Built/Open
STH 310 / CTH R
Two Rivers, Wisconsin
FD, DR
Built/Open
US 8 / TH 27
Ladysmith, Wisconsin
PD, DR
Built/Open
US 12 (South Blvd) / STH 123
Baraboo, Wisconsin
DR
2008
US 53 / Old Town Hall Road
Washington, Wisconsin
FD, DR, L
Built/Open
USH 14 / CTH X
Village of Darien, Wisconsin
DR, L
2010
USH 18 / Main Street / W. Iowa Street
Prairie du Chien, Wisconsin
FD, DR
2009
USH 18 / Main Street / W. Wisconsin Street
Prairie du Chien, Wisconsin
FD, DR
2009
USH 41 / CTH G (Main Ave) NB Interchange
Brown County, Wisconsin
DR
2010
USH 41 / CTH G (Main Ave) SB Interchange
Brown County, Wisconsin
DR
2010
USH 41 / Lombardi Avenue NB Interchange
Brown County, Wisconsin
FD, DR, L
2010
USH 41 / Lombardi Avenue SB Interchange
Brown County, Wisconsin
FD, DR, L
2010
USH 41 / Oneida St (CTH AAA) NB Interchange
Brown County, Wisconsin
FD, DR, L
2010
USH 41 / Scheuring Rd (CTH F) NB Interchange
Brown County, Wisconsin
FD, DR, L
2009
USH 41 / Scheuring Rd (CTH F) SB Interchange
Brown County, Wisconsin
FD, DR, L
2009
USH 41 / Waube Ln (CTH AAA) SB Interchange
Brown County, Wisconsin
FD, DR
2012
Water Street (STH 80) / Madison Street
Platteville/Pine, Wisconsin
DR
2011
Wisconsin Avenue / Prospect Street, Mini
Village of Denmark, Wisconsin
PD
2010