Salt Lake County, Utah
As one of Salt Lake Valley’s critical north-south corridors, Bangerter Highway moves an average of 58,000 vehicles per day. With continued growth, that number is expected to double by 2040 and without major improvements, delays will increase by four times over the next 25 years.
A majority of intersections along Bangerter Highway operated using traffic signals, leading to severe congestion over the years. To meet both current and future needs of drivers and local communities, these traditional intersections were to be replaced grade-separated interchanges to improve traffic flow and reduce the risk of accidents.
Michael Baker, as part of a joint venture, provided design services to transform the four intersections at 5400 South, 7000 South, 9000 South and 11400 South to grade-separated interchanges. The project consisted of constructing four new freeway interchanges, pavement replacement, protection of a large aqueduct, protection and relocation of existing utilities, maintenance of traffic at each interchange, and providing safe facilities for pedestrian and bicycle traffic during and after construction.
The project’s major components included constructing walls and embankments, four new highway overpass bridges, new or rehabilitated storm drainage systems, new PCCP pavement tie-in sections, replacement of a 260-foot single-span truss style pedestrian bridge and supporting traffic signals and infrastructure. The new interchanges vastly improve both the north-south traffic flow along Bangerter Highway and the traffic flow on the west-east cross streets, which now have less traffic light wait times.
Limiting the impacts of this project to the public was accomplished through a phased approach to maintenance of traffic (MOT). The team’s MOT plan considered each interchange as a sub-project, where each section was designed to be worked on concurrently, starting with the accelerated schedule at the 7000 South interchange location, which completed design and construction in under a year to avoid costly impacts to local businesses. Through a phased approach to MOT, all lane closure durations met Utah Department of Transportation (UDOT) requirements, lane shifts were minimal and pedestrian access remained largely open for members of the community.
“This design-build project helped relieve congestion and provide opportunities for the Salt Lake Valley area to keep moving. The project also preserved and enhanced critical infrastructure in the region to optimize mobility and safety for residents.”
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