Split intersection

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 feet (61 to 91 m), 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,
• 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;

Town center intersection

File:Center town intersection (TCI) (grn).svg

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.

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)

Further reading

• Simulation of the Split Intersection, ATTAP, University of Maryland, 11 November 2015

External links

• Animation of a town center intersection