why no left turn at intersection

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Re: why no left turn at intersection

Postby bz2012 » Thu Dec 19, 2013 12:20 pm

Here is a slightly different kind of apparent "routing problem" that would take the user an extra 95.3 miles and 46 minutes (those figures are from livemap routing laramie,wy to lovell, wy vs laramie to casper to lovell. The two step route is much shorter and faster. I admit that I have not checked every segment and node along the 404.66 mile route to make sure that there are no bad settings.)

https://www.waze.com/editor/?zoom=5&lat ... TTTTTTTTTT

ccdmas wrote:....
It would be a *really* nice move if there'd be some official staement from Waze staff here.
....
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Re: why no left turn at intersection

Postby bz2012 » Sat Dec 14, 2013 3:22 pm

It amazes me that WAZE is still having these kinds of routing problems, 9 months after this topic was started!

It seriously undermines the trust drivers put in the app.

Someone needs to take a long and serious look at the routing programs and fix this bug.
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Re: why no left turn at intersection

Postby bz2012 » Fri Nov 01, 2013 12:02 pm

CBenson wrote:It seems that way! I wish there was a better explanation.


Perhaps the routing server has developed sentience and is "just messin' with us".
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Re: why no left turn at intersection

Postby bz2012 » Sat Mar 30, 2013 11:56 pm


That one IS strange. Livemap correctly navigates through the intersection NOW and color highlighter indicates no recent changes in that area.

Perhaps WAZE has been working on the routing problems!
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Re: why no left turn at intersection

Postby bz2012 » Sat Mar 30, 2013 12:01 pm

CBenson wrote:Yes, I agree that in you example waze is avoiding the minor highway. But if you are turning onto Baltimore Annapolis Blvd. you have to make the major/minor transition somewhere so I don't see why that would favor the straight/U.


Perhaps WAZE haz gone CRAZy.
It seems to be WRONGLY routing people. I suspect that many don't bother to report, they just go to a different GPS system.

By the way, the original topic of this discussion was 'fixed' by making that U-turn a 'parking lot road'.
It now routes correctly
2013-03-30_070634.png
2013-03-30_070634.png (14.51 KiB) Viewed 3070 times
via a left turn rather than the right, left, left. :)
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Re: why no left turn at intersection

Postby bz2012 » Sat Mar 30, 2013 3:57 am

I quite agree that it is bad routing!
I notice that the segment WAZE avoids is a 'Minor Highway'.
WAZE may be favoring the U turn because it is 'Major'?

Livemap gives the same route.
Here is a more interesting routing. WAZE avoids the nearby permitted U-turn and favors the further distant one.
2013-03-29_225345.png
2013-03-29_225345.png (84.68 KiB) Viewed 4181 times
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Re: why no left turn at intersection

Postby bz2012 » Mon Mar 25, 2013 11:05 am

CBenson wrote:
jemay wrote:I have resolved things like this by rebuilding each junction node (disconnect each segment and create a new junction node (don't drag the old junction back in). After that I never got the u-turn route again...

I suspect you're just destroying the speed data showing the right is significantly faster than the left.
I have one (discussed here) that has been repeatedly torn apart over the past year and put back together by different editors. URs show the intersection will occasionally route right/U again.


Interesting discussion.

By the way, the FIRST TIME I clicked on your link it took me to the wrong topic!
viewtopic.php?f=143&t=1702
rather than
viewtopic.php?f=143&t=17026
for some reason! When I tried again, it worked fine.
STRANGE.
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Re: why no left turn at intersection

Postby bz2012 » Mon Mar 25, 2013 10:43 am

jemay wrote:I have resolved things like this by rebuilding each junction node (disconnect each segment and create a new junction node (don't drag the old junction back in). After that I never got the u-turn route again...


Hmmmm. I'll try that if the problem persists. Thanks for the suggestion!

I have done something similar with junctions that 'have a bad node' that simply refuses to connect.
I use a small temporary segment connected to each segment near the bad node to 'trim off the end' of each segment.
Delete all the cut off ends and temporary segments.
And then connect the 'freshly trimmed ends'.
This has 'fixed' the 'bad node' problem, every time.
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Re: why no left turn at intersection

Postby bz2012 » Sun Mar 24, 2013 6:32 pm

CBenson wrote:
bz2012 wrote:I don't really think WAZE should EVER route people via a 'U-turn' when there is another way to get there.

Ok, but it seems to me that is an argument for removing the segment as U-turns are its only function.


Yes, but if I remove it, and someone running WAZE uses it, then WAZE will pop up a 'Map Problem' and ask for it to be put in. Someone will come along and put a street there.

THAT is why I prefer to put a 'parking lot road' there.
Then, WAZE will not flag it as a problem when people drive thru it, but it won't route them through it 'unless absolutely necessary.' (like to get to an address on northbound segment.) [at least that is how I understand what would happen. I am pretty sure that NO ONE really KNOWS what WAZE will do, a large portion of the time, because it is rather complex. :) ]
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Re: why no left turn at intersection

Postby bz2012 » Sun Mar 24, 2013 6:00 pm

CBenson wrote:
bz2012 wrote:I think another possible 'fix' is to make the 'crossover' on the long route a 'parking lot road'.
Any objections to this?

I don't think this is a good idea. First, its not really a parking lot road. Second, from a routing perspective, you might as well simply remove it rather than making it a parking lot road. If you make it a parking lot road, I don't think it will ever be used for routing.


I don't really think WAZE should EVER route people via a 'U-turn' when there is another way to get there. U-turns are dangerous, even when legal, especially when there is no 'left only' lane leading to the U-turn. I believe there is a high incidence of accidents associated with U-turns, in general.

When I drive, I try to avoid making U-turns, even when legal. I would rather go down a side street or into a parking lot to turn around.

I always make 'safety of the drivers' my first priority.
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