A freeway junction or highway interchange (NA) or motorway junction (UK) is a type of road junction linking one controlled-access highway (freeway or motorway) facility to another, to other roads, or to a rest area or motorway service area.
Both North American (NA) and British (UK) terminology is included. For left-side driving, the layout of junctions is mirrored. Note: The descriptions of interchanges apply to countries where vehicles drive on the right side of the road. The Light Horse Interchange in Sydney, the largest in Australia. Interchanges are almost always used when at least one road is a controlled-access highway (freeway or motorway) or a limited-access divided highway (expressway), though they are sometimes used at junctions between surface streets. It differs from a standard intersection, where roads cross at grade. In the field of road transport, an interchange (American English) or a grade-separated junction (British English) is a road junction that uses grade separations to allow for the movement of traffic between two or more roadways or highways, using a system of interconnecting roadways to permit traffic on at least one of the routes to pass through the junction without interruption from crossing traffic streams. This is a complicated five-level stack interchange, due to the proximity of frontage roads and segregated high-occupancy vehicle lanes.
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