Roundabouts, diamonds and 'dog‑bone' designs vie as leading options for Main Street interchange
Consultants presented multiple interchange geometries — diamond interchanges, multi‑lane and 'peanut' roundabouts, and enlarged roundabouts — and noted trade‑offs between preserving Front Street access, vehicle throughput and the need for design exceptions.
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The PAC heard descriptions and trade‑offs for several interchange geometries. The presenter described Concept 1 as a modified diamond with signalized ramp terminals that would lengthen and widen off‑ramps to allow separate left and right turn lanes. "So the modified single line sketches ... are fairly easy and quick to produce but what they don't show are the details," the Presenter said, noting sketches omit curb lines, sidewalks and bike lanes.
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