In the field of road transport, an interchange is a road junction that typically uses grade separation, and one or more ramps, to permit traffic on at least one highway to pass through the junction without directly crossing any other traffic stream. It differs from a standard intersection, at which roads cross at grade. Interchanges are almost always used when at least one of the roads is a limited-access divided highway (expressway or freeway), though they may occasionally be used at junctions between two surface streets.
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1 Terminology
1.1 Complete interchanges
2 Between two motorways
2.1 Four-way interchanges
2.1.1 Cloverleaf interchange
2.1.2 Stack interchange
2.1.3 Cloverstack interchange
2.1.4 Turbine interchange
2.1.5 Roundabout interchange
2.1.6 Other/hybrid interchanges
2.2 Three-way interchanges
2.2.1 Trumpet interchange
2.2.2 Directional T interchange
2.2.3 Full Y interchange
2.2.4 Other/hybrid interchanges
2.3 Two-way interchanges
2.4 One-way interchanges
3 Between a motorway and a non-motorway road
3.1 Diamond interchange
3.2 Parclo interchange/folded diamond
3.3 Diverging diamond interchange
3.4 Single-point urban interchange
3.5 Other/hybrid interchanges
4 See also
5 References
6 External links
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