Split intersection

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 ft, allowing 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 being replaced by two intersections. The beginning one-way traffic at the fourth leg makes the intersections reduce the number of conflicts similar 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, 33.07084°N, -96.79625°W
 * At New Dallas Highway (US-77) and E. Industrial Boulevard TX-340 in Lacy Lakeview, Texas, 31.60535°N, -97.11095°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, 51.01805°N, -114.16526°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; 30.16569°N, -95.46645°W
 * Along Highway 10 in Surrey, British Columbia, at the intersection with King George Boulevard; 49.10487°N, -122.83156°W

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; 30.17689°N, -95.46607°W
 * Springwoods Village Parkway at Holzwarth Road in Spring, Texas; 30.09644°N, -95.45128°W
 * San Elijo Road at Elfin Forest Road in San Marcos, California; 33.09844°N, -117.19989°W
 * 170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.