A split intersection is a rarely built at-grade variant of the

diamond interchange A diamond interchange is a common type of road junction, used where a controlled-access highway crosses a minor road. Design The freeway itself is grade-separated from the minor road, one crossing the other over a bridge. Approaching the ...

. Compared to a conventional four-leg intersection or road crossing, the arterial road is split into separate

carriageway A carriageway (British English) or roadway (North American English) consists of a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally. A carriageway generally consists of a number of traf ...

s by , 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 One-way traffic (or uni-directional traffic) is traffic that moves in a single direction. A one-way street is a street either facilitating only one-way traffic, or designed to direct vehicles to move in one direction. One-way streets typical ...

at the fourth leg makes the intersections reduce the number of conflicts similar to a three leg T-intersection to improve

traffic flow In mathematics and transportation engineering, traffic flow is the study of interactions between travellers (including pedestrians, cyclists, drivers, and their vehicles) and infrastructure (including highways, signage, and traffic control de ...

Existing examples

* At Legacy Drive and Preston Road,

Plano, Texas Plano ( ) is a city in Collin County and Denton County, Texas, United States. It had a population of 285,494 at the 2020 census. It is a principal city of the Dallas–Fort Worth metroplex. History European settlers came to the area near ...

, with

Texas U-turn A Texas U-turn, or Texas turnaround, boomerang, or loop around, is a lane allowing cars traveling on one side of a one-way frontage road to U-turn onto the opposite frontage road (typically crossing over or under a freeway or expressway). Typical ...

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 Perth is the capital and largest city of the Australian state of Western Australia. It is the fourth most populous city in Australia and Oceania, with a population of 2.1 million (80% of the state) living in Greater Perth in 2020. Perth is ...

* 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 Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, ...

, by adding a bridge in the middle. * At Sarcee Trail and Richmond Road,

Calgary Calgary ( ) is the largest city in the western Canadian province of Alberta and the largest metro area of the three Prairie Provinces. As of 2021, the city proper had a population of 1,306,784 and a metropolitan population of 1,481,806, maki ...

, Alberta, Canada, * Four intersections along Terwillegar Drive in

Edmonton Edmonton ( ) is the capital city of the Canadian province of Alberta. Edmonton is situated on the North Saskatchewan River and is the centre of the Edmonton Metropolitan Region, which is surrounded by Alberta's central region. The city anc ...

, Alberta, Canada *Four intersections along Manning Drive in Edmonton, Alberta, Canada * Lake Woodlands Drive at Grogans Mill Road in The Woodlands,

Texas Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...

;

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. The TCI's grade-separated variant is the

three-level diamond interchange A three-level diamond interchange is a type of highway interchange where through traffic on both main roads is grade-separated from intersections which handle transferring traffic. It is similar in design to a three-level stacked roundabout ex ...

Examples

* Grogans Mill Road at Research Forest Drive in The Woodlands,

; * Springwoods Village Parkway at Holzwarth Road in

Spring Spring(s) may refer to: Common uses * Spring (season), a season of the year * Spring (device), a mechanical device that stores energy * Spring (hydrology), a natural source of water * Spring (mathematics), a geometric surface in the shape of a h ...

; * San Elijo Road at Elfin Forest Road in San Marcos,

California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the ...

; *170 Street and Stony Plain Road and 100 Ave in Edmonton, Alberta.

References

External links

Animation of a town center intersection
{{Road junction types Road junction types

Existing examples

Town center intersection

Examples

See also

References

Further reading

External links