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, 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,
- At New Dallas Highway 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 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
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.