[Page update] Controlling_U-turn_penalties

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[Page update] Controlling_U-turn_penalties

Postby nzahn1 » Tue Oct 17, 2017 2:06 pm

Implementing the guidance from staff, that unidirectional U-turns on divided highways should use JB to prevent prohibited u-turns not micro-doglegs to 'break' U-turn prevention mechanisms.

Allowing median U-turns current
Code: Select all
To allow a double-left or double-right turn through the median segment, break any one of the [[#Preventing median U-turns|above conditions]]. For example:

* 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 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.

[[File:U-turn selective Uturn prevention.png|center]]
Allowing median U-turns proposed
Code: Select all
To allow a double-left or double-right turn through the median segment, break any one of the [[#Preventing median U-turns|above conditions]]. For example:

* 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.  {{As of|2017}}, 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.}}
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Re: [Page update] Controlling_U-turn_penalties

Postby herrchin » Tue Oct 17, 2017 4:48 pm

Perhaps remove the opening line completely? Instead of providing general guidance to break one of the 3 conditions, the bullets now provide the preferred and explicit way to handle unidirectional and bidirectional situations.
WoP wrote:To allow a double-left or double-right turn through the median segment, break any one of the above conditions. For example:
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