A split intersection is a rarely-built at-grade variant of the diamond interchange. Compared to a conventional four-leg intersection or road crossing, the arterial road is split into separate carriageways by , which allows a queue of left turning vehicles behind a completed turn into the crossroad without any conflict to oncoming traffic. On the crossroad, the four-leg intersection is replaced by two intersections.
The beginning of one-way traffic at the fourth leg makes the intersections reduce the number of conflicts, similarly to a three-leg T-intersection, to improve traffic flow. (PDF)
Existing examples At Legacy Drive and Preston Road, Plano, Texas, with Texas U-turn lanes, At New Dallas Highway (US-77) and E. Industrial Boulevard TX-340 in Lacy Lakeview, Texas, At Stock Road and Winterfold Road in Perth, Australia It is the most common intersection design on Utah State Route 85, also called Mountain View Corridor. They are planned to be later converted, mostly into diamond interchanges, by adding a bridge in the middle. At Sarcee Trail and Richmond Road, Calgary, Alberta, Canada, Four intersections along Terwillegar Drive in Edmonton, Alberta, Canada Four intersections along Manning Drive in Edmonton, Alberta, Canada Lake Woodlands Drive at Grogans Mill Road in The Woodlands, Texas; Along Highway 10 in Surrey, British Columbia, at the intersection with King George Boulevard; At West Ridge Road (NY-104) and Long Pond Road, in Greece, New York. This intersection is also signed as a Truck U-Turn, as trucks wishing to access commercial property on the opposite side of the divided roadway are only permitted to perform U-Turns at intersections signed as such.
Town center intersection
A town center intersection (TCI) is similar to a split intersection; however, both the arterial road and the crossroad are split into separated one-way streets. The resulting grid, most often implemented in a city, reduces conflicts to two directions per intersection.
The TCI's grade-separated variant is the three-level diamond interchange.
Examples
Grogans Mill Road at Research Forest Drive in The Woodlands, Texas; Springwoods Village Parkway at Holzwarth Road in Spring, Texas; San Elijo Road at Elfin Forest Road in San Marcos, California; 170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.
See also Offset T-intersection Hamburger intersection (Throughabout)
References
Further reading Simulation of the Split Intersection, ATTAP, University of Maryland, 11 November 2015
External links Animation of a town center intersection