Segments that act as U-Turn Issue

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Segments that act as U-Turn Issue

Postby BehnamNHappy » Thu Sep 15, 2016 2:12 pm

Hi,
I think something changed in waze routing,
it's a while that waze ignore segments that should act as U-Turn! for this issue many users reporting fault in map that a U-Turn is missing but it exist just waze is not using it!
here is an example
there is a U-Turn before roundabout but waze ignores!.
this problem made many issues in many places.
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Re: Segments that act as U-Turn Issue

Postby KTCAOP » Thu Sep 15, 2016 3:22 pm

Because all of those segments are under 15 meters and the two roads leading in/out are parallel, they all fit under the category that would cause Waze to discourage the maneuver as a U-Turn.

The question would be do you want the roundabout to act as a U-Turn in all directions? Also, the road in particular U-Turn Shahrdari is not going to be used at all as a U-Turn.

Here is the USA Page on the topic.
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Re: Segments that act as U-Turn Issue

Postby BehnamNHappy » Thu Sep 15, 2016 7:54 pm

Thanks for your information,

My problem is the segment "u-turn shahrdari" that waze recently does not use it any more,
before there was no problem and waze route from that segment.
according to the link you gave I made change to that segment (one way U-Turn) hope this solve the problem.
and as sample I made change for this segment also (Two way U-Turn)
Let's see what will happen.
But even if these changes solve the problem, next issue is we have millions of these kind of U-Turns across the country which mean the map needs massive edits + beginner editors don't know this issue.
I don't understand why waze did that!
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Re: Segments that act as U-Turn Issue

Postby KTCAOP » Thu Sep 15, 2016 9:38 pm

There is a reason for this and there are many places where this is actually quite useful.

I currently do not have the script on me to double check whether or not the angles are set appropriately, but I will check when I go home. If you want to allow for a two way U-Turn as in the second example, I would make the "median segment" or the "U-Turn" segment larger than 14 meters.

Happy to share information any time!
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Re: Segments that act as U-Turn Issue

Postby BehnamNHappy » Thu Sep 15, 2016 10:59 pm

There is a reason for this and there are many places where this is actually quite useful.

Can u give an example place which is useful and why? so I'll get the idea and use it in my edits.

I currently do not have the script on me to double check whether or not the angles are set appropriately, but I will check when I go home.

thanks.
If you want to allow for a two way U-Turn as in the second example, I would make the "median segment" or the "U-Turn" segment larger than 14 meters.

well in my 2nd example I can make median segment 15m, but because in some other places 2 parallel segments are more close I 1st changed the angels to see if I can fix this issue only by changing angels.

This is 3rd example : median is 15m long but still waze does not use it :(

I tried to change some other U-Turns also in different scenarios but after saving my work I reload the page and see changes did not submitted! I think WME got some issue now :D. I'll try tomorrow.
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Re: Segments that act as U-Turn Issue

Postby KTCAOP » Fri Sep 16, 2016 1:26 am

I will try to pull examples shortly.

In the first example, I am seeing the angles at 88.1 and 88.5 - totaling 176.5 - so the angles need to be adjusted a bit more.

In the third example, yes, it appears to be 15 meters, but it is exactly on the borderline, increasing its size slightly would allow it to be used. Per the wikipedia page - it is best to make it 16 meters.

Both of these examples, using the WME Junction Angle Indicator Script show me that these are indeed U-Turn Restricted.

I just reread - yes, I heard that there was a sort of "undoing" that has occurred on the international server. I will check in tomorrow.
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Re: Segments that act as U-Turn Issue

Postby BehnamNHappy » Fri Sep 16, 2016 2:08 pm

unfortunately WME still not working, as soon as it Fixed I'll fix U-Turns.
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Re: Segments that act as U-Turn Issue

Postby KTCAOP » Sun Sep 18, 2016 11:17 pm

Let us know!

I'd be happy to give it another look =)
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Re: Segments that act as U-Turn Issue

Postby BehnamNHappy » Mon Sep 19, 2016 7:36 am

Hi, thanks a lot
Here is examples that all fixed(changed the length to more than 15m) :
https://www.waze.com/editor/?env=row&lon=51.37398&lat=35.78105&zoom=6&segments=260319773
https://www.waze.com/editor/?env=row&lon=51.36468&lat=35.77122&zoom=7&segments=296296204

I just don't know why this one still have problem
in this case I didn't made the length of the segment more than 15 & just changed the angle.
according to the wiki, changing the angle also should solve the problem.
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Re: Segments that act as U-Turn Issue

Postby KTCAOP » Mon Sep 19, 2016 5:43 pm

It is not the median angle that needs to change, but rather the segment incoming or outgoing.

It would be better to think of Waze checking to see if the two segments are "Parallel" or not.

In this case, while you did change the angle of the median angle, both of the side streets are parallel.

Therefore, by putting in a dogleg on either the incoming or outgoing segment using a geometry node that should fix the issue.
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