From Wazeopedia


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Best practices for different types of crossings
==Best practices for different types of crossings==
Crossings can be classified according to the number of single and split(double) roads involved in the crossing. For each of these there exist solutions to prevent U-turns.
Why prevent U-turns?
* We do not want Waze to suggest illegal routings. Ever. U-turns are rarely ever allowed, but Waze will suggest one on each and every occasion where it thinks it is appropriate.
* Ad-hoc routing gets better if no U-turns are possible.
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