Split intersection
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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 200 to 300 feet (61 to 91 m), 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.
Existing examples
- At Legacy Drive and Preston Road, Plano, Texas, with Texas U-turn lanes, 33°04′15″N 96°47′46″W / 33.070835°N 96.796246°W
- At New Dallas Highway (US-77) and E. Industrial Boulevard TX-340 in Lacy Lakeview, Texas, 31°36′19″N 97°06′39″W / 31.605353°N 97.110952°W
- 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, 51°01′05″N 114°09′55″W / 51.018046°N 114.165263°W
- 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; 30°09′56″N 95°27′59″W / 30.165692°N 95.466449°W
- Along Highway 10 in Surrey, British Columbia, at the intersection with King George Boulevard; 49°06′18″N 122°49′54″W / 49.1048703°N 122.8315582°W
- 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
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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; 30°10′37″N 95°27′58″W / 30.176893°N 95.466073°W
- Springwoods Village Parkway at Holzwarth Road in Spring, Texas; 30°05′47″N 95°27′05″W / 30.096443°N 95.451283°W
- San Elijo Road at Elfin Forest Road in San Marcos, California; 33°05′54″N 117°12′00″W / 33.098444°N 117.199894°W
- 170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.