From Wazeopedia
Fixed JB rank error (was 5, now using Rank template) in "Allowing median U-turns" section
To allow median U-turns in both directions, break condition #2 by making the median segment (B) {{:Routing_penalties/U-turn_minimum|greater}} ''or longer''
To allow a U-turn from only one direction, first setup the intersection to allow U-turns in both directions. Then, add a [[Junction Box]], and restrict the prohibited U-turn route. A rank {{As ofRank|2017jb}}, a rank 5 user or above is required to install a Junction Box.
{{mbox|text=Previously, unidirectional U-turn prohibition on a divided road was set up by breaking condition #3 of the U-turn prevention mechanism through the use of a [[Glossary#mDL|micro-dogleg]]. {{As of|2017}}, Waze staff has expressed a preference that map editors use Junction Boxes in these situations.}}
<!-- OLD INFORMATION * To allow a U-turn from only one direction, first set up U-turn prevention for both directions. Break condition #3 on the side where U-turns are allowed. Increase or decrease the angles so that the in and out segments (A and C) are [[#Checking for parallel incoming and outgoing segments|not parallel]]. A [[Glossary#mDL|micro-dogleg]] can be used to change the angle without changing the appearance of the segment.