Diverging Diamond Interchange

As part of the California Department of Transportation (Caltrans) and San Diego Association of Governments (SANDAG) state Route 11 (SR-11)/Otay Mesa East Port of Entry project, crews from Skanska US Civil are constructing the final segment of the future toll road SR-11 and the southbound connector ramps, linking southbound State Route 125 (SR-125) to eastbound SR-11 and eastbound state Route 905 (SR-905).

Officials ceremonially shoveled dirt in Austin last July to launch the latest rendition of an interchange design called a "diverging diamond interchange." Commonly referred to as a DDI, the design is a relatively new wrinkle in highway architecture. It continues to find favor in the United States for the simple reason that it moves traffic safely.

DDIs are particularly effective at locations, like the one in Alabama, that have: High volumes of left-turn traffic on and off of freeway ramps Left-turn related safety challenges  Moderate and unbalanced crossroad traffic through the interchange A need for additional capacity, without widening  According to the Alabama Department of Transportation (ALDOT), "DDIs improve safety by reducing vehicle-to-vehicle conflict points from 26 — as in a conventional diamond interchange — to 14 points.

Phase 2 of the Florida Department of Transportation's (FDOT) First Coast Expressway project (FCE) is underway and expected to be delivered in mid-2025. Back in March, crews from Sacyr Construction USA LLC first began working on the north segment of the job, a $229 million contract that is being funded by the Florida Turnpike Enterprise.

Another diverging diamond intersection (DDI) is coming to Travis County, following a groundbreaking ceremony on July 24 for the I-35 at Parmer Lane project. The Texas Department of Transportation was joined by Texas Transportation Commission Chairman J.

Described as a project that will help move people and products for decades to come, a $50 million undertaking to reconstruct two busy interchanges along Interstate 17 in north Phoenix, Ariz., is under way. The Arizona Department of Transportation (ADOT) is overseeing the work, which started in late November 2018.

Work is set to begin in March on Segment 2 of the $1.6 billion I-75 modernization project in Oakland County, Mich., part of the Detroit metropolitan area. The roadway is the most heavily used commuter route in the county, with 174,000 vehicles traveling it daily.

Considered one of the top ten construction priorities for the Utah Department of Transportation (UDOT) in 2018, the I-215 Redwood Road project requires crews to build a new bridge east of the existing Redwood Road bridge over I-215. The ongoing work also includes converting the existing I-215 and Redwood Road interchange to a diverging diamond interchange.

Construction is under way on an interchange improvement project on Interstate 24 at Hickory Hollow Parkway in Nashville. The current interchange at Exit 60 is a partial-access facility, which was constructed to accommodate the Hickory Hollow Mall area in the 1970s.

Beginning Feb. 22, the Utah Department of Transportation (UDOT) began a major project to improve operations at I-215 and Redwood Road in North Salt Lake City by building a Diverging Diamond Interchange (DDI). The following work is planned: Setting concrete barrier on the east side of northbound Redwood Road, from Recreation Way to I-215, to begin widening to the east.

Construction of the area's first Diverging Diamond Interchange (DDI) under I-95 at A1A Exit 373 is moving at a steady pace in Florida's Nassau County. The more than $40 million project consists of reconstruction and widening of 2.2 miles of A1A from west of I-95 to west of Still Quarters Road, widening of ramps at Interstate 95/A1A exit 373 to Yulee/Callahan/Amelia Island/Fernandina Beach and the reconfiguration of the interchange under Interstate 95.