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Junction Style Guide/Interchange

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The highway/freeway segments before and after the junction should be named the same. The ramp segments should be named in accordance with the section on [[Road names#Exit|exit ramp names]]. In addition, if an exit carries a concurrent route away from the highway, for example a US route that was carried by an interstate up to the exit but splits off at the exit, that route designation should be added as an alternate name on all ramp segments that carry it.
=== {{Anchor|Wayfinders|Terminology|Criteria|Configuration|Segment naming}}Complex exit ===
A complex exit is a junction where one or more exit ramps leave the highway, and the continuation of the highway is not obvious to drivers. Therefore, another instruction is needed for traffic continuing on the highway. This can be a "keep" or "continue" instruction. When mapping complex exits, the geometry should match the instruction given, so for "continue" instructions the geometry should be set up as described for exits in [[#Ramp geometry and complexity|ramp geometry and complexity]], and for keep instructions (i.e. most wayfinder exits), the geometry should be set up in the same way as a [[#Freeway fork geometry|freeway fork]]. For criteria and further details on mapping complex exits, see [[wayfinder]] and [[turn instruction override]].
Because of name inheritance, the shortness of the stub, and the combination of turn instruction overrides, the name of the stub will be used in instructions at the exit, and the name of the ramp past the stub will be used at the ramp fork. This method should only be used when it's not possible to replicate what drivers see on guide signs using simple naming or name inheritance.
== {{Anchor|Interchange configurations}}Configurations ==
=== {{anchor|Diamond Interchangeinterchange}}Diamond ===
: [[Image:Jct_diamond.png]]
''See also: [[Wikipedia:Diamond_interchange|Diamond interchange article on Wikipedia]]''
The single surface street segment between the inner most ramps should be either raised or lowered in relation to the freeway segments depending on the actual geography at the interchange.
=== {{anchor|Cloverleaf Interchangeinterchange}}Cloverleaf ===
: [[Image:Jct_cloverleaf.png]]
'''Note on elevation: '''The single surface street segment between the inner most ramps should be either raised or lowered in relation to the freeway segments depending on the actual geography at the interchange.
=== {{anchor|Folded Diamond Interchangediamond interchange}}Folded diamond ===
: [[Image:Jct_folded_diamond.png]]
''See also: Discussion of Folded Diamonds and A2/B2 Partial Cloverleafs on the [[wikipedia:Partial_cloverleaf_interchange|Partial Cloverleaf Interchange article on Wikipedia]]''
'''Note on Elevation: '''The two surface street segments (between the outer ramps and connected to the single point) and the four ramp segments connected to the single point should all be the same level, either one higher or one lower than the elevation of the freeway segments above/below the single point.
=== {{Anchor|Collector/Distributor Lanes}}Collector/distributor lanes ===
These are lanes parallel to, but physically separated from, the lanes of a Freeway that serve to keep merging traffic out of the flow of through traffic on the mainline freeway.
=== {{Anchor|
Diverging diamond interchange (DDI)|Diverging diamond interchange|Diverging_diamond_interchange|DDI}}Diverging diamond (DDI) ===
''See also:'' [[Wikipedia:Diverging_diamond_interchange|Diverging Diamond Interchange]] article on Wikipedia.
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