→4-Way-Crossings: Change bullets to sub-headings for easier navigation
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).
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.
This one allows for U-turns to be made if you enter over one of the double lanes.
Ugly! If you cannot turn this one into a SSSS or DDSS, consider adding an extra fork on the single road and create a DDDD.
This crossing allows U-turns in each and every direction if no precautions are taken.