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]
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.
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]