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4-Way-Crossings: Change bullets to sub-headings for easier navigation
==4-Way-Crossings==
*===Simple 4-Way-Crossing (SSSS)===
[[Image:Crossing_SSSS.jpg]]
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 single roads (DSSS)===
[[Image:Crossing_DSSS.jpg]]
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.
*2 ===Two Dual roads crossing 2 single roads (DDSS)===
[[Image:Crossing_DDSS.jpg]]
This one allows for U-turns to be made if you enter over one of the double lanes.
*3 ===Three Dual roads crossing 1 single road (DDDS)===
[[Image:Crossing_DDDS.jpg]]
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]].
*4 ===Four Dual roads crossing (DDDD)===
[[Image:Crossing_DDDD.jpg]]
This crossing allows U-turns in each and every direction if no precautions are taken.
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