Junction may refer to:
http://en.wikipedia.org/wiki/Junction Junction (traffic) where several traffic routes cross:
junction (rail), a railroad/railway junction
Intersection (road), a road junction
Interchange (road), a motorway junction -
http://en.wikipedia.org/wiki/Interchange_(road) Terminology
Note: The descriptions of road junctions are for countries where vehicles drive on the right side of the road. For countries where driving is on the left the layout of the junctions is the same, only left/right is reversed.
A freeway junction or highway interchange (in the U.S.) or motorway junction (in the UK) is a type of road junction, linking one motorway to another; to other roads; or sometimes to just a motorway service station. In the UK, all junctions on a motorway with other roads are numbered—the first being called "Junction 1", etc. In the U.S., interchanges are either numbered according to cardinal interchange number, or by mileage.
A highway ramp (as in exit ramp and entrance ramp) or slip road is a short section of road which allows vehicles to enter or exit a freeway (motorway).
A directional ramp always tends toward the desired direction of travel. This means that a ramp that makes a left turn exits from the left side of the roadway (a left exit). Left directional ramps are relatively uncommon as the left lane is usually reserved for high-speed through traffic. Right ramps are almost always directional.
A non-directional ramp goes in a direction opposite to the desired direction of travel. Many loop ramps (as in a cloverleaf) are non-directional.
A semi-directional ramp exits a road in a direction opposite from the desired direction of travel, but then turns toward the desired direction of travel. Many 'flyover ramps' (as in a stack) are semi-directional.
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