Split intersection explained

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 200feetto300feetft (toft), 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.^{[2] [3]}

Existing examples

• At Legacy Drive and Preston Road, Plano, Texas, with Texas U-turn lanes, 33.0708°N -96.7962°W
• At New Dallas Highway (US-77) and E. Industrial Boulevard TX-340 in Lacy Lakeview, Texas, 31.6054°N -97.111°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, 51.018°N -114.1653°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; 30.1657°N -95.4664°W
• Along Highway 10 in Surrey, British Columbia, at the intersection with King George Boulevard; 49.1049°N -122.8316°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.^{[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; 30.1769°N -95.4661°W
• Springwoods Village Parkway at Holzwarth Road in Spring, Texas; 30.0964°N -95.4513°W
• San Elijo Road at Elfin Forest Road in San Marcos, California; 33.0984°N -117.1999°W
• 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

Notes and References

1. Joe G. . Bared . Evangelos I. . Kaiser . amp . Advantages of The Split Intersection . Public Roads . . 63 . 6 . June 2000 .
2. Joe . Bared . Evangelos . Kaiser . amp . 2000 . Benefits of Split Intersections . Journal of the Transportation Research Board . . 1797 . 34–41 . 10.3141/1737-05 .
3. Book: Lee A. . Rodegerdts . Brandon . Nevers . Bruce . Robinson . John . Ringert . Peter . Koonce . Justin . Bansen . Tina . Nguyen . John . McGill . Del . Stewart . Jeff . Suggett . Tim . Neuman . Nick . Antonucci . Kelly . Hardy . Ken . Courage . amp . Federal Highway Administration . https://www.fhwa.dot.gov/publications/research/safety/04091/10.cfm#c1031 . Signalized Intersections: Informational Guide . Chapter 10.3.1 . FHWA-HRT-04-091 . 2004 . (PDF)
4. Web site: Town Center One-Way Couplets (Pt 1) | Place Making Alternative Intersections.
5. Web site: See all Town Center Intersections.