Split intersection

A split intersection is a rarely-built at-grade variant of the diamond interchange.^[1] 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.

Split intersection

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.^[2][3]

Existing examples

• At Legacy Drive and Preston Road, Plano, Texas, with Texas U-turn lanes, 33.070835°N 96.796246°W / 33.070835; -96.796246
• At New Dallas Highway (US-77) and E. Industrial Boulevard TX-340 in Lacy Lakeview, Texas, 31.605353°N 97.110952°W / 31.605353; -97.110952
• 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, 51.018046°N 114.165263°W / 51.018046; -114.165263
• 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; 30.165692°N 95.466449°W / 30.165692; -95.466449
• Along Highway 10 in Surrey, British Columbia, at the intersection with King George Boulevard; 49.1048703°N 122.8315582°W / 49.1048703; -122.8315582
• 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

Town Center Intersection (TCI)

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.^[4][5]

The TCI's grade-separated variant is the three-level diamond interchange.

Examples

• Grogans Mill Road at Research Forest Drive in The Woodlands, Texas; 30.176893°N 95.466073°W / 30.176893; -95.466073
• Springwoods Village Parkway at Holzwarth Road in Spring, Texas; 30.096443°N 95.451283°W / 30.096443; -95.451283
• San Elijo Road at Elfin Forest Road in San Marcos, California; 33.098444°N 117.199894°W / 33.098444; -117.199894
• 170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.

See also

• Offset T-intersection
• Hamburger intersection (Throughabout)