Title:

Durham US Route 4 & Madbury Rd

This project addresses safety and efficiency concerns at the intersection of Route 4 and Madbury Road in Durham, New Hampshire—an area with a documented history of high crash frequency and traffic congestion. Our team evaluated three potential design alternatives: the addition of dedicated left-turn lanes, the construction of an overpass, and the implementation of a two-lane roundabout. Each alternative was assessed based on key criteria, including vehicular and pedestrian safety, emergency access, traffic flow efficiency, and cost. Following a comprehensive analysis involving a design matrix, cost estimation, and review of similar intersections, the roundabout was selected as the preferred solution. The proposed roundabout features tapered entry lanes, a central island with a 127-foot diameter, and lane configurations designed to reduce crash risk and eliminate signal-related delays. With a total projected cost of $3.4 million, the roundabout provides a cost-effective, long-term solution that improves safety and traffic operations while minimizing disruption to the surrounding area.

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