Stack interchange
A type of freeway interchange / From Wikipedia, the free encyclopedia
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A directional interchange, colloquially known as a stack interchange, is a type of grade-separated junction between two controlled-access highways that allows for free-flowing movement to and from all directions of traffic. These interchanges eliminate the problems of weaving, have the highest vehicle capacity, and vehicles travel shorter distances when compared to different types of interchanges.
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The first directional interchange built in the world was the Four Level Interchange which opened to Los Angeles traffic in 1949.