United States Department of Transportation
i
Safety and Traffic Operations at Cloverleaf Interchanges [Project Capsules]
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2023-11-01
[PDF-587.08 KB]
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Abstract:The efficient operation of highway interchanges is critical for the creation of an effective highway system designed to transport large numbers of cars quickly and safely over long distances. In this regard, the diamond interchange is the most common type of roadway interchanges where a major highway intersects a minor facility. It is suited for both rural and urban regions. One advantage of the diamond interchange is that it doesn’t take up much space, and therefore is relatively economical to construct. On the other hand, it increases the possibility of congestion. At the intersection of two fully controlled access facilities or when left turns at-grade are forbidden, a cloverleaf interchange is the simplest design that can be used. A cloverleaf interchange is suitable in a rural setting where right-of-way is not an issue and weaving is minor. However, cloverleaf interchanges can be also suitable in urban regions based on site conditions.
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