Title:

NH Route 16 at NH Route 113 Roundabout

The primary objective of this project was to design a safer and more accessible intersection at NH Route 16 and NH Route 113, while minimizing disruption to traffic flow. The student team worked alongside HEB Engineers, who were contacted by the NCC Regional Planning Commission. Guidance was also provided by Dr. Jo Sias of the University of New Hampshire. There are several key issues contributing to safety concerns. Route 113 approaches Route 16 at a skewed angle, reducing visibility and complicating turning movements. Additional sight distance limitations stem from elevation changes and surrounding vegetation. The design process began with compiling data and comparing it against design guidelines to identify critical issues. Based on these findings, four improvement alternatives were developed: a roundabout, a traffic signal, realignment, and dedicated turning lanes. A decision matrix was used to compare the options, with the roundabout emerging as the preferred solution. The roundabout concept prioritizes safety while limiting impacts on the surrounding area. Based on this design, the roundabout was modeled in Synchro to test operational performance. The project concluded with a preliminary cost estimate and construction phasing plan.

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