College Avenue/John Street/
Walter Street Intersection
City of Appleton, Wisconsin

The existing intersection experienced significant traffic delays and had a high amount of crashes. As part of the City of Appleton's reconstruction of College Avenue from Drew Street to Matthias Street, the intersection was redesigned. Both a signalized intersection and a roundabout were evaluated. The roundabout was selected and is a multi-lane roundabout with all three legs having dual lane entrances. The eastbound approach was designed to have a right-turn bypass added in the future.

Key to the success of this project was the public education on multi-lane roundabouts. OMNNI assisted the city in putting together education information including posters, brochures and presentations.

"The College/John/Walter roundabout has exceeded all expectations of the City of Appleton. Because this was our first dual lane roundabout we were unsure of the success of this new type of intersection within our community.

With OMNNI Associate's design, construction management and public education expertise, the roundabout experience has been a huge success! This roundabout has significantly improved the capacity and safety of this intersection.

OMNNI staff went above and beyond in many ways including working with the City and WisDOT staff to develop an educational brochure which we believe played a significant role in the success of this roundabout."

Paula Vandehey, P.E. DPW
City of Appleton

STH 55 Corridor (STH 96 to USH 41)
Outagamie County, Wisconsin

• CTH OO & 55
• Maloney Rd/Gertrude & STH 55
• Northbound Ramps & STH 55
• Southbound Ramps & STH 55

This project involves the reconstruction and widening of one mile of STH 55 from a two lane rural section to a 4 lane urban section including the reconstruction of 4 intersections to multi-lane roundabouts. The project starts in a residential area and proceeds thru an industrial park.  The roadway carries a high percentage of truck traffic. Three of the four roundabouts are in close proximity to each other. They include the Maloney Road / Gertrude intersection, the northbound USH 41 ramps and the southbound USH 41 ramps. The ramp roundabouts have further challenges due to the constraints of the structure carrying USH 41 traffic over STH 55, which will not be replaced.

The existing STH 55 is a 2-lane roadway and the USH 41 ramps are single lane ramps. STH 55 is free flow and the ramps have a stop condition. Within the life of the ramp intersections, USH 41 may be reconstructed to 6 lanes, at which time the structure and the ramps will be reconstructed. Due to the fact that the existing structure will not allow there to be the required number of lanes for the design year traffic, both an interim and ultimate design is being completed for the ramp intersections. To minimize future construction costs and traffic impacts, the roundabouts were located correctly for both the interim and future lane configurations.

Eisenhower Drive Corridor
Outagamie County, Wisconsin

This project is located just east of the STH 441/CTH CE interchange and involved the evaluation of intersection alternatives at the CTH CE (College Avenue) & Eisenhower Drive and Eisenhower Drive & Van Roy intersections. Traffic delays and safety are critical issues at these closely spaced intersections in a developing area. Various intersection alternative combinations were analyzed, including signalized intersections and roundabouts.

The intersection of CE and Eisenhower Drive will be a multi-lane roundabout with three lanes entering. Right-turn bypass lanes are being designed, but will be constructed at a later date, on three of the legs.  

The intersection of Van Roy Road and Eisenhower will be a multi-lane roundabout with two lanes entering on three of the legs and a single lane entering on one leg.

USH 41 and 9th Avenue Interchange
Winnebago County, Wisconsin

• 9th Ave & Washburn St
• 9th Ave & Southbound USH 41 Ramp
• 9th Ave & Northbound USH 41 Ramp
• 9th Ave & Koeller St

This project is a portion of the USH 41 six-lane project in Winnebago County. The 9th Avenue corridor consists of four intersections, Washburn Street, the southbound and northbound USH 41 ramp terminals and Koeller Street. The interchange was reconfigured as a tight diamond interchange.  9th Avenue has two through lanes in each direction. All four of the existing signalized intersections were designed as roundabouts.

OMNNI’s role in the project was to take the concept/preliminary layout of the 9th Avenue corridor as defined in the USH 41 Ramp Terminal Intersection Study Report and develop 60% plans and then final plans and specifications.  Some of the design challenges besides the close proximity of the intersections are the vertical profile through the roundabouts and construction staging to allow access to Washburn Street and Koeller Street.

Lake Park/Plank Road
Lake Park/Kensington
City of Appleton, Wisconsin

The reconstruction of approximately 1,200 feet of Lake Park Road from the Plank Road to Kensington Drive intersection and includes the reconstruction of the Plank Road and Kensington Drive intersections as roundabouts.

The existing intersection of Lake Park Road and Plank Road was a four-way stop with Plank Road intersecting Lake Park Road at approximately 60 degrees. There is a significant amount of utilities located in and around this intersection, which added to the complexity of determining the best location for the roundabout. Three of the legs have single lane entries and exits. The fourth leg has a two-lane entry and a single lane exit.

The existing intersection of Lake Park Road and Kensington Drive was a three-way stop with a right turn bypass from Lake Park northbound onto eastbound Kensington. Adjacent to the intersection is a combination of commercial and residential properties. Lake Park, legs 1 and 2, are single-lane entries and exits. Leg 3, Kensington Drive, is a two-lane entry and a single lane exit.

STH 22 & 54 Bypass
Waupaca, Wisconsin

As part of the STH 22 & 54 bypass project, the connections of the bypass with the existing STH 22/54 on the east side of Waupaca was designed and constructed as a multi-lane roundabout. This roundabout includes design of high-speed approaches, exclusive right turn lane, exclusive left turn lanes and a right turn by-pass lane.

Midway Road Corridor
City of Appleton, Wisconsin

• Telulah Ave & Midway Road
• Plank Road & Midway Road
• Lake Park Road & Midway Road

This project involved three potential roundabouts for the south side of Appleton. Midway Road, which is also County Highway AP, was relocated/extended to the intersection of Eisenhower Drive. OMNNI provided feasibility, analysis and preliminary layout for roundabouts at the existing intersection of Midway Road and Telulah Avenue, the new intersection of Midway Road and Plank Road and the new intersection of Midway Road and Lake Park Road. Based on traffic analysis, each roundabout needed to have multi-lane entrances and exits along Midway Road and single lane entrances and exits on the side road. However, each location provided its own unique challenges.

The Midway/Telulah intersection is located close to an elementary school and residential dwellings in each quadrant that are located very close to the intersection. Because one of the residents would need to be acquired, this roundabout option did not move forward.  The Midway/Plank intersection was a T intersection that required the Plank Road to be slightly realigned to form an acceptable angle with the new Midway Road. The Midway/Lake Park intersection has residents in the north quadrants and a proposed development in the southeast quadrant.

USH 10 & STH 55 Intersection
Calumet County, Wisconsin

This project is located at the intersection of USH 10 and STH 55 southeast of the City of Appleton in the Town of Harrison, Calumet County. The existing condition required STH 55 traffic to stop for USH 10. Although the intersection had good sight distance in all directions, drivers were still making poor decisions when leaving the stop sign. The intersection had a crash rate of 1.55 with over 80% of the crashes being right-angle crashes and 62% of the crashes resulting in either injuries or fatalities.

The roundabout is a single lane rural roundabout. Because of the high speed approaches, the splitter islands were designed to help reduce the speeds as traffic approaches the intersection. The roundabout was designed to facilitate large farming equipment and oversized trucks.

USH 10 and STH 32/57
Calumet County, Wisconsin

This project is located at the intersection of USH 10 and STH 32/57 in the Town of Brillion. The intersection had safety issues with trucks on USH 10 frequently going through on red lights even with the yellow timing maximized. The accident rate for crashes over the past five years was 0.45 with seven out of nine resulting in injuries.

The roundabout will be a single-lane rural roundabout. Because of the high speed approaches, the splitter islands have been designed to help reduce the speeds as traffic approaches the intersection. The roundabout has been designed to facilitate large farming equipment and oversized trucks. Due to many drainage issues located around the intersection a hydraulic analysis of the area was performed. The proposed culverts and ditches will significantly improve drainage in the area. Construction is planned for 2012.

CTH G and Paradise Drive Intersection
Washington County, Wisconsin

This fast-tracked project involved converting a traditional 4-legged intersection to a roundabout. The existing condition was 45 mph on CTH G with a stop condition on Paradise Drive. The intersection is in a transition area from rural to urban with existing development in the northern quadrants of the intersection. The geometrics of the roundabout needed to minimize impacts to those developments. In addition to the roundabout analysis and geometric design, relocating a major drainage way along the south side of Paradise Drive added to the complexity of the project.