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Junction Style Guide/Interchange

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Use of the {{Ramp}} type is governed by the following rules:
* [[Road types/USA]]
* [[At-grade connectors]]
Specific examples of how to handle common junction types are provided in later sections. All of those examples use the basic building blocks provided here.
If you are unsure what road type you should use, refer to the '''[[Road types/USA|USA Road road types]]''' article.
=== Exits ===
The Highway/Freeway segments before and after the junction should be named the same. The ramp segments should be named in accordance with the best practices in your location.
[[Road names/USA#Exit_ramps_and_Entrance_ramps_.28on-ramps.29|US Specific Ramp Names]]
[[Road types and names|Naming standards for other areas]]
* If the OUT segment is an exit, it should be named following the guidelines for an unsigned exit.
* If the OUT segment is a short continuation of the same road leading to another road, name the segment starting with "to" followed by the name of the road to which the continuation leads, following these guidelines:
** {{anchor|no BGS to}}[[File:No BGS To exit.PNG|300px|thumbnail|right]]Where the wayfinder is just before, but not at, the termination of a road, so the continuation OUT segment is named for the road that the continuation leads to at the termination. However you still must travel for a short distance on the continuation of this road until those exits/termination. [[File:No BGS To exit zoom out.PNG|300px|thumbnail|right]]Our example here is a wayfinder on US-1-9 N (Truck), the left OUT is the continuation, however the right OUT also continues on the same road until it intersects with SR-440, with an exit to SR-440 S along this short segment. There are no roadway signs for any of these forks, or exits/terminations. The OUT segment here would be named '''"to SR-440 S / Communipaw Ave"''', and the SR-440 exit will be named following the [[Road_Names_(USA)Road_Names#Exit_ramps_and_entrance_ramps_.28on-ramps.29|unsigned exit guidelines]]. However it may be appropriate (if there are no House Numbers, or other on ramps past this wayfinder before it reaches the exit, to leave this entire portion with no name, and the instruction will inherit the name of the next road to which you are going.{{clear}}
The straight through motion from the exit ramp to the entrance ramp should typically be enabled, if legal to drive. Under normal circumstances, the Big Detour Prevention mechanism discourages the routing server from routing someone off the freeway and directly back on. When the freeway path between the ramps is closed, or slow enough to overcome the Detour penalty, this off-on route may be given as a desirable alternative.
Be aware that the Big Detour Prevention penalty is intended to discourage routing that leaves a freeway (or highway) and returns to the same freeway (or highway). Therefore, at least one name (primary or alternate) of the freeway/highway segment before the exit ramp must exactly match one name (primary or alternate) of the freeway/highway segment after the entrance ramp to trigger the penalty. For further information see the [[Detour Prevention Mechanisms/USA|Big Detour Prevention Mechanism]] page.
The [[Detour Prevention Mechanisms/USA|detour prevention mechanism]] will discourage Waze from routing users onto the collector-distributor and back onto the freeway – as long as the city name on the freeway is the same (or set to "no city") before, throughout, and after the collector-distributor. Previously this feature was not available and the ramps were set up to restrict the through route. Some of these ramp configurations may still be set up that way, so they can now be configured as pictured above with the through route enabled.
==== Complex collector/distributor interchanges ====
Where collector/distributor lanes are used as part of an interchange, use the {{Ramp}} type for the collector/distributor lanes. Name the ramp segments as you would any other ramp segment.
Ensure that a name on the Freeway segments is consistent before and after the collector/distributor lanes, so that the [[Detour Prevention Mechanisms/USA|detour prevention mechanism]] will prevent Waze from routing users erroneously.