MTJ Engineering’s Mark Johnson, P.E. provided the horizontal design, signing and marking recommendation for this roundabout project in Gahanna, Ohio, working as a technical expert to MS Consultants.

MTJ performed an operational analysis of the Hamilton Clark State roundabout on 2016 (build-year) and 2026 (10-year) design to determine the acceptability of opening the roundabout in an interim configuration with less capacity than is necessary for the long-range traffic but allows for ease of adding future capacity expansion when necessary. Safety benefits may be realized by providing a simpler design with only the capacity that is necessary for the early years of operation.