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Council reviews Silver Summit interchange study, weighs SPUI vs. dual roundabouts
Summary
County staff and UDOT presented a study of the Silver Summit interchange that found existing operations failing and modeled two leading alternatives: a costly Single-Point Urban Interchange (SPUI) and a lower-cost but more land-intensive dual-roundabout option; council members favored phased roundabout improvements and asked staff to revisit right-of-way needs before recording nearby plat amendments.
County staff and consultants presented the Silver Summit Interchange Study to the Summit County Council on April 5, outlining traffic counts, future forecasts and two primary design alternatives for handling anticipated growth around Kimball Junction and Silver Creek Village.
The study team — including Brandon Brady and Carl Miller (county transportation), Gary Horton (Wall Consulting Group) and Charles Mason Hill (UDOT) — told the council that traffic counts taken last October show routine morning queuing at the southbound off-ramp at US-40 and Silver Summit Parkway and that, under a full-build 2030 scenario, three of four studied intersections would operate at unacceptable levels without improvements.
The report evaluated seven design alternatives and focused on two recommended options. The Single-Point Urban Interchange (SPUI) would reconfigure ramps and require rebuilding the bridge structure, delivering higher long-term vehicle capacity but at substantially higher cost and a longer implementation timeline.…
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