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), 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.[2] [3]
Existing examples
[edit ]- At Legacy Drive and Preston Road, Plano, Texas, with Texas U-turn lanes, 33°04′15′′N 96°47′46′′W / 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°36′19′′N 97°06′39′′W / 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°01′05′′N 114°09′55′′W / 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°09′56′′N 95°27′59′′W / 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°06′18′′N 122°49′54′′W / 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
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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
[edit ]- Grogans Mill Road at Research Forest Drive in The Woodlands, Texas; 30°10′37′′N 95°27′58′′W / 30.176893°N 95.466073°W / 30.176893; -95.466073
- Springwoods Village Parkway at Holzwarth Road in Spring, Texas; 30°05′47′′N 95°27′05′′W / 30.096443°N 95.451283°W / 30.096443; -95.451283
- San Elijo Road at Elfin Forest Road in San Marcos, California; 33°05′54′′N 117°12′00′′W / 33.098444°N 117.199894°W / 33.098444; -117.199894
- 170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.
See also
[edit ]References
[edit ]- ^ Bared, Joe G. & Kaiser, Evangelos I. (June 2000). "Advantages of The Split Intersection". Public Roads. Vol. 63, no. 6. Federal Highway Administration. Archived from the original on December 7, 2021.
- ^ 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.[dead link ]
- ^ 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". Place-Making Intersections. 4 February 2017.
- ^ "See all Town Center Intersections".
Further reading
[edit ]- Simulation of the Split Intersection, ATTAP, University of Maryland, 11 November 2015