This project involved the addition of turn lanes to S.R. 125 and a new mast arm traffic signal. The project also involved the installation of a new roadway with a roundabout. One leg continued on to a new healthcare facility and the other two legs were stubbed out for future development of the 50 acres opened up by the new roadway. The project includes the extension of public utilities (sewer, water, gas, electric, etc.), sidewalks, and highway lighting. The project, which was installed in coordination with the Clermont County Transportation Improvement District (TID), was designed in 2018 with construction in 2019. COEC provided the topographic survey, roadway, roundabout, signal, and lighting design; the Clermont County TID preformed bidding and inspection. 

Roadway Information	SR 125 ADT – 31,239
Services Provided	Topographic survey, roadway design, and roundabout design
Year	2019
Construction Cost	$1,800,000
Reference	Jeremy Evans, Clermont County Engineer (513) 732-8857 jevans@clermontcountyohio.gov

This project involved the design of a 125-foot inscribed diameter, single lane roundabout at the entrance to GROB Systems and Bluffton Airport. GROB Systems is in the process of large expansion projects that is to add over 200 jobs in the next 10 years. Current and future traffic projections do not warrant a signal at the intersection. However, GROB employees are experiencing delay at daily shift ends. The improvement of the intersection with a roundabout decreases delay and spurs future growth on the east side of Bluffton. GROB Systems also requires oversized truck loads for operations. The roundabout has been sized for 80’ low-boy trailers to circumnavigate the roundabout and has provided flattened truck aprons to allow oversized haulers to by-pass the roundabout.  

Services Provided	Topographic survey, construction plans, utility, coordination, traffic capacity modeling, and right of way plans
Year	2025
Construction Cost	$2,250,000
Reference	Jesse Blackburn, Village Administrator  (419) 358-2066

 

This project involved the design of a 136-foot inscribed diameter, single lane roundabout at the entrance to the Greene County Airport. The purpose and need of the project was to plan for accommodating future traffic growth with the installation of a nearby interchange along US35 in Green County. The single lane roundabout 4th leg was to be stubbed out for future by-pass connection between township arterials to alleviate congestion and provide alternative connection to US35 interchange. Furthermore, the roundabout contained additional modeling and grading work to allow for the future expansion of by-pass drop lanes to allow for heavier traffic volumes.  

Services Provided	Topographic survey, construction plans, utility coordination, traffic capacity modeling and right of way plans
Year	2024
Construction Cost	$3,133,326
Reference	Stephanie Goff, County Engineer (937) 562-7503, stephanie.goff@greenecountyohio.gov

ODOT Small Cities Congestion Mitigation funded project to provide a by-pass route for through traffic to avoid turning movements within the downtown region of the City of Kenton. The single lane, 3-legged roundabout is to provide free-flow congestion mitigation near downtown Kenton and provide a connection to by-pass large truck traffic to the outsides of downtown. 

Services Provided	Topographic survey, construction plans, utility coordination, and right of way plans
Year	2027
Construction Cost	$4,110,000
Reference	Cynthia Murray, Safety-Service (419) 674-4850

For the City of Vandalia, COEC provided concepts for consideration to develop a roundabout at the intersections of National Road and Ranchview, National Road and Dixie Drive, and National Road and Peters Pike. 

Reference:  Rob Cron, Director of Public Services, (937) 415-2323, rcron@vandaliaohio.org