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), 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

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.


See also


  1. ^ Bared, Joe G. & Kaiser, Evangelos I. (June 2000). "Advantages of The Split Intersection". Public Roads. Vol. 63, no. 6. Federal Highway Administration.
  2. ^ 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.
  3. ^ 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)
  4. ^ "Town Center One-Way Couplets (Pt 1) | Place Making Alternative Intersections".
  5. ^ "See all Town Center Intersections".

Further reading