The Florida Department of Transportation (FDOT) began construction in January 2017 on the area’s first Diverging Diamond Interchange (DDI) at Interstate 95 in Nassau County.
This project consists of widening the roadway from 4 lanes to 6 lanes with raised medians, curb & gutter, sidewalks and bicycle lanes (2 miles). This project will also include the addition of a new Diverging Diamond Interchange (DDI)* under I-95 at A1A Exit 373 (to Callahan/Yulee/Fernandina Beach/Amelia Island).
Diverging Diamond Interchange (DDI)
A diverging diamond interchange (DDI) is a type of interchange where the two directions of traffic below I-95 briefly drive on the opposite side of the road. This will be a significant improvement in safety, since long left turns crossing traffic lanes to enter or exit the Interstate will be eliminated. Additionally, the DDI promotes added 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.
3D Animation of a DDI
A DDI for pedestrians and bicyclists
Educational DDI video for Nassau County
Diamond Interchange vs DDI