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CLAY COUNTY, Fla. --
From FDOT: As part of First Coast Expressway construction, the planned traffic shift at the State Road 16/First Coast Expressway interchange is planned overnight on Wednesday, June 18.
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6/5/25 Update from FDOT: The planned traffic shift at the State Road 16/First Coast Expressway interchange has been postponed to later this month.
6/3/25 Update from FDOT: As part of First Coast Expressway construction, the planned traffic shift at the State Road 16/First Coast Expressway interchange has been postponed to Friday, June 6 due to weather.
6/2/25 FDOT is opening an intersection that's new to Clay County on Tuesday, June 3, at the State Road 16/First Coast Expressway interchange in Green Cove Springs. The diverging diamond interchange is pictured here:
 You can also watch an explanatory video on how a Diverging Diamond Interchange (DDI) works, here: https://www.youtube.com/watch?v=lcEKPyX9Ypg
All ramps at the interchange will remain closed until this segment of the First Coast Expressway is opened to traffic, which FDOT anticipates to be this summer.
From FDOT: A diverging diamond interchange (DDI) is an interchange design in which the two directions of traffic on State Road 16 below the First Coast Expressway will briefly drive on the opposite side of the road. This intersection design creates significant improvements in safety, since long left turns crossing traffic lanes are eliminated and potential conflict points are reduced to 14 from the 26 found in traditional interchange designs.
Additionally, the DDI promotes efficiency with only two clearance intervals (the time for traffic signals to change from green to yellow to red) instead of the six or more found in other interchange designs. The DDI at State Road 16 will join the DDI at Henley Road and First Coast Expressway as the first of this kind in Clay County.
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Clay County, Florida, blends tradition with innovation to promote prosperity, advancement, and a strong sense of community rooted in family values. Located just southwest of Jacksonville along the scenic St. Johns River, the County is home to more than 236,000 residents. It hosts the 73,000-acre Camp Blanding Training Facility and boasts a proud military heritage dating back to its founding in 1858. The Clay County Board of County Commissioners is committed to preserving the county's rich history and core values while embracing its progress, focusing on public safety, and supporting our strong business community to serve the county's current residents while building a legacy for future generations. Learn more at claycountygov.com.
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