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*'''U-turns can be prevented by reducing the length of the segment crossing the median to less than {{:Routing_penalties/U-turn_minimum}} and leaving this segment unnamed.'''
<!-- Need to confirm the segment needs to be unnamed.-->
==3-Way-Crossings==
===Simple 3-Way-Crossing (SSS)===
[[Image:Crossing_SSS.jpg]]
==Crossing Types=={| class="wikitable unsortable" border="1"|+ Three-way Crossings|-! Name! Image! scope="col" width="320px" | Description|-| Simple three-way crossing<br/>(SSS)| [[Image:Crossing_SSS.jpg|200px]]|Not much to say about this - except that it is the ideal 3-way crossing: simple, stable, solid. Not much can go wrong with this one! If you have to deal with any of the following types of crossing, you may first look if it is possible to turn them into this type, because it prevents a lot of trouble later on.|-| Single road crossing a dual road<br/>(SSD)| [[Image:Crossing_SSD.jpg|200px]]| The next simple type of crossing has limitations. The way it is drawn here there is nothing that stops Waze from plotting a U-turn. Coming over the double road it takes two left-turns to get back on the road you came from. Typically that is NOT what you want.|-| Dual road crossing a single road<br/>(DDS)| [[Image:Crossing_DDS.jpg|200px]]||-| Three dual roads crossing<br/>(DDD)| [[Image:Crossing_DDD.jpg|200px]]| When this type of crossing is generated in the [[basemap]], it looks like the image presented here. It allows for U-turns in all directions.|-|}{{Clear}}
 ===Single road crossing a dual road (SSD)={| class="wikitable unsortable" border="1"[[Image:Crossing_SSD.jpg]]|+ Four-way Crossings The next simple type of crossing has limitations. The way it is drawn here there is nothing that stops Waze from plotting a U-turn. Coming over the double road it takes two left|-turns to get back on the road you came from. Typically that is NOT what you want.! Name===Dual road crossing a single road (DDS)===[[! Image:Crossing_DDS.jpg]]  ! scope="col" width==Three Dual roads crossing (DDD)==="320px" | Description[[Image:Crossing_DDD.jpg]] When this type of crossing is generated in the basemap, it looks like the image presented here. It allows for U|-turns in all directions. ==4-Way-Crossings=====| Simple 4four-Way-Crossing way crossing<br/>(SSSS)===| [[Image:Crossing_SSSS.jpg|200px]] | Ah, the "Mother of all Crossings!"! We are lucky that almost all crossings look like this. It is possible to define each and every turn restriction with a single node, and U-turns do not happen when all 4 roads in this junction are locked (No, there is no evidence for that. But each and every time a simple crossing does allow a U|-turn, at least one of the roads was found not to be locked. If all roads are locked, Waze routes you around a block instead of making a U-turn).  ===| Dual road crossing 3 three single roads <br/>(DSSS)===| [[Image:Crossing_DSSS.jpg|200px]] | This is an ugly crossing if you come from/go to the SE. You get a direction to "Turn left, turn right". First check whether the double road can be made into a single one, so you get a SSSS. If that fails, you may want to join the double lanes into a single node, creating a sort of half-mapcat-bowtie.|-===| Two Dual dual roads crossing 2 two single roads <br/>(DDSS)===| [[Image:Crossing_DDSS.jpg|200px]] | This one allows for U-turns to be made if you enter over one of the double lanes.|-===| Three Dual dual roads crossing 1 one single road <br/>(DDDS)===| [[Image:Crossing_DDDS.jpg|200px]] | Ugly! If you cannot turn this one into a [[#Simple 4-Way-Crossing (SSSS)|SSSS]] or [[#Two Dual roads crossing 2 single roads (DDSS)|DDSS]], consider adding an extra fork on the single road and create a [[#Four Dual roads crossing (DDDD)|DDDD]].|-===| Four Dual dual roads crossing <br/>(DDDD)===| [[Image:Crossing_DDDD.jpg|200px]] | This crossing allows U-turns in each and every direction if no precautions are taken.|}{{Clear}}
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