Wheeler Rd. & Aumond Rd.
Augusta, GA
MTJ developed the final horizontal geometric recommendations for the proposed roundabout.
We developed a design aimed at minimizing impacts to adjacent and surrounding residential properties and arriving at an appropriate design for this site that meets the safety, operational and large vehicle objectives for this project.
The roundabout was designed to accommodate WB 50 vehicles for all movements and WB 62 for thru movements.
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SR 515 Corridor
Young Harris, GA
MTJ developed the operational/capacity analysis to establish necessary laneage based on long-range 2039 design-year flows utilizing Rodel v1.88.
Our final design check review included fast path, view angle, and large truck movements (WB-65).
We provided corrective horizontal redesign geometrics for the two roundabouts reflective of the capacity analysis and design review issues.
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20th Ave. & Harlan St.
Edgewater, CO
BACKGROUND
To address multimodal safety, mobility, and vehicular performance, the city of Edgewater retained MTJ to evaluate the feasibility of a compact-style roundabout at this commercial, highly constrained intersection.
SUMMARY
Alternative concepts addressed these key issues:
- Minimize/avoid undesirable ROW impacts to surrounding properties
- Ensure compatibility with existing and/or proposed roadway cross sections, to include ped and bike design features – cycle track and on-street bike facilities
- Accommodate necessary design vehicles:
- Large trucks/freight
- Transit and school buses
- Emergency response/fire trucks
Two alternatives were developed to evaluate optimal size/shape and fit with acceptable impacts. The resulting optimal design was a non-circular 107’ x 95’ ICD compact-style roundabout. The compact-style design allows the central island to retain landscape features that will promote visual conspicuity for this application.
HIGHLIGHTS
- Minimized undesirable ROW impacts to surrounding properties
- Compatible with existing roadway cross sections, providing optimal pedestrian/ bicycle accommodations
- Accommodated large trucks, transit/school buses, emergency response vehicles
- Non-circular compact-style roundabout
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Franklin Blvd. Corridor: 7 Mini-Roundabouts
Cleveland, OH
OVERVIEW
The City of Cleveland launched a rehabilitation project for Franklin Blvd. that included a series of 7 mini-roundabouts to promote traffic-calming along the corridor.
SUMMARY
Working with partner firm GPD Group, MTJ provided roundabout peer review and horizontal design optimization that included:
- Review of proposed mini-roundabout designs
- Developing final horizontal designs
- Documentation of designs and modifications
- Application of appropriate traffic and roadway design principles (system considerations)
MTJ’s design optimization/peer review approach ensured:
- Adherence to roadway and roundabout design safety principles
- State-of-the-practice mini-roundabout design techniques
- Safety for all modes – pedestrians, bicyclists, vehicles
- Application of best practices to conform to FHWA Mini-Roundabouts Technical Summary
HIGHLIGHTS
- Constrained urban residential context
- Complete Streets/Multimodal
- Avoids ROW impacts
- Series of 7 mini-roundabouts
- Maximizes ped/bike comfort/safety
- Minimizes roadway construction/costs
“A special thank you to Mark Johnson 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
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NW 10th St. & N. Virginia Ave. / NW 10th St. & N. Pennsylvania Ave.
Oklahoma City, OK
OVERVIEW
MTJ (as part of the Lee Engineering team) evaluated the feasibility of two roundabout applications at these highly constrained sites.
SUMMARY
MTJ Roundabout Engineering developed multiple geometric designs for evaluation of feasibility.
Each design achieves operational, accessibility and safety objectives for all modes – vehicular, pedestrian, and cyclists.
Design highlights:
- Horizontal designs that minimized adverse impacts to surrounding context
- Designs highlighting safety for all modes
- Sensitivity analysis to reflect accommodation of future traffic growth
- Business access and circulation facilitation
HIGHLIGHTS
- Highly constrained context
- Multimodal safety priority
- Minimization of adverse impacts
- Double-roundabout alternatives
- Business access and circulation facilitation
- Interim/ultimate designs
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Fremont Blvd. / SR 1 / California Ave. / Monterey Rd.
Monterey County, CA
OVERVIEW
This TAMC/Caltrans-led project provided roundabout solutions for the interchange at Fremont Blvd., SR 1, California Ave. and Monterey Rd. that serves Monterey County, CA.
SUMMARY
MTJ provided roundabout design optimization/peer review support that included:
- Rodel operational analysis
- Highly developed concept designs
- Documentation of designs and modifications
- Application of appropriate traffic and roadway design principles (system considerations)
MTJ’s design optimization/peer review approach ensured:
- Adherence to roadway and roundabout design principles
- State-of-the-practice roundabout design techniques
- Safety: Ensure safety for all modes – peds, bicycles, vehicles
- Application of FHWA Performance Checks (NCHRP 672)
MTJ also applied best practices to conform to NCHRP Report 834, Crossing Solutions at Roundabouts and Channelized Turn Lanes and PROWAG, Public Rights-of-Way Accessibility Guidelines.
HIGHLIGHTS
- 2-roundabout design for new interchange
- Highly constrained urban context
- Rodel operational analysis for proper laneage
- State-of-the-art roundabout design principles
- Accommodation of large trucks/freight
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Hillsborough St. Corridor
Raleigh, NC
OVERVIEW
The Hillsborough Street Improvement Program was created to improve a two-mile corridor in this University district in Raleigh, NC. The goal was to revitalize the area by adding roundabouts, enhancing pedestrian and vehicle safety, and creating a more vibrant business district.
SUMMARY
As a subconsultant to Kimley-Horn, MTJ’s corrective designs optimized safety for all modes, minimized potential impacts to adjacent properties, and minimized impacts on business circulation and parking.
The MTJ redesigns shifted all three ICDs east. The corrections removed the skew in the design of several roundabouts, which improved pedestrian safety, accommodated truck movements more effectively, and improved speed control.
HIGHLIGHTS
- Minimized impacts to adjacent land uses
- Improved pedestrian safety
- Maintained business access/circulation
- Large truck/freight accommodations
- Highly constrained context
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N. 124th St. & Cactus Rd. / Anasazi Elementary School
Scottsdale, AZ
OVERVIEW
The City of Scottsdale was seeking a solution to the school traffic congestion and safety at the existing stop-controlled intersection adjacent to Anasazi Elementary School.
SUMMARY
MTJ’s horizontal geometric designs for this intersection is predicated on traffic engineering and roundabout design principles and overall project objectives, to include:
- Adherence to speed control safety criteria
- Optimal roundabout safety for all modes
- Large truck/bus movements design vehicle
- Minimize adverse ROW/environmental impacts
- Match proposed new cross sections
- Minimize roadway reconstruction and costs
- Accommodate Complete Streets cross sections
- Pedestrian safety design principles in NCHRP 834 – Crossing Solutions at Roundabouts and Channelized Turn Lanes for Pedestrians with Vision Disabilities (and PROWAG)
HIGHLIGHTS
- Adjacent to elementary school
- Complete Streets/multimodal
- Avoids adverse ROW impacts
- Maximizes ped/bike safety
- Mini-roundabout application; 85’ ICD
- Large truck/emergency response vehicle accommodation
- Accommodates on-street parking
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Carmel Country Rd. & Carmel Mountain Rd.
San Diego, CA
OVERVIEW
MTJ Roundabout Engineering was retained to evaluate the feasibility of a roundabout at this commercial, highly constrained intersection.
SUMMARY
Alternative concepts addressed these key issues:
- Minimize/avoid undesirable ROW impacts to surrounding properties
- Ensure compatibility with existing and/or proposed roadway cross sections, to include ped and bike design features – cycle track and on-street bike facilities
- Accommodate necessary design vehicles:
- Large trucks/freight
- Transit and school buses
- Emergency response/fire trucks
Three alternatives were developed to evaluate optimal size/shape and fit with acceptable impacts.
The resulting compact style design allows the central island to retain landscape features that will promote visual conspicuity for this application.
HIGHLIGHTS
- Minimized undesirable ROW impacts to surrounding properties
- Compatible with existing roadway cross sections, including cycle track
- Accommodated large trucks, transit/school buses, emergency response vehicles
- Non-circular compact style roundabout
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Mar Vista Dr. & Soledad Dr.
Monterey, CA
OVERVIEW
MTJ developed an optimized mini-roundabout re-design for the residential arterial intersection of Mar Vista & Soledad Dr. located in the City of Monterey, CA.
SUMMARY
The MTJ redesign has been optimized to address our review findings and provide best fit and optimal safety (for all modes), accommodated design truck movements, and specific design features to address the unique context of this application.
The MTJ optimized redesigned mini-roundabout addresses the following key issues associated with alignment curvature, vehicle speeds and associated driver expectancy and pedestrian safety, including:
- Modified the approach alignment for a more appropriate curve radii
- Extended the west leg splitter island to incorporate channelization principles to address driver expectancy and to assist with inducing slower vehicular speeds
- Provided a depressed area with mountable curb to allow access to the adjacent residential drive.
Additionally, the redesign:
- Meets FHWA speed control criteria for all movements, and specifically reduces the predominant EB to SB RT movement with modified alignment, and tighter geometrics
- Maintains acceptable impacts to the same or similar level to that of the original design
- Provides additional pedestrian circulation within same footprint of original design/existing roadway
- Utilized Cal Legal 65 Design vehicle for all movements (mini-roundabout fully mountable center island is key)
HIGHLIGHTS
- Mini-roundabout with an ICD = 82’
- Maintained acceptable impacts to ROW
- and surrounding land uses
- Mountable splitter-island for residential access
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