Split intersection
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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), 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
- 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
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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
- 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
References
- ^ Bared, Joe G. & Kaiser, Evangelos I. (June 2000). "Advantages of The Split Intersection". Public Roads. Vol. 63, no. 6. Federal Highway Administration.
- ^ Bared, Joe & Kaiser, Evangelos (2000). "Benefits of Split Intersections". Journal of the Transportation Research Board. Vol. 1797. Transportation Research Board. pp. 34–41. doi:10.3141/1737-05.
- ^ Rodegerdts, Lee A.; Nevers, Brandon; Robinson, Bruce; Ringert, John; Koonce, Peter; Bansen, Justin; Nguyen, Tina; McGill, John; Stewart, Del; Suggett, Jeff; Neuman, Tim; Antonucci, Nick; Hardy, Kelly & Courage, Ken (2004). "Chapter 10.3.1". Signalized Intersections: Informational Guide. Federal Highway Administration. FHWA-HRT-04-091. (PDF)
- ^ "Town Center One-Way Couplets (Pt 1) | Place Making Alternative Intersections".
- ^ "See all Town Center Intersections".
Further reading
- Simulation of the Split Intersection, ATTAP, University of Maryland, 11 November 2015