why no left turn at intersection

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Re: why no left turn at intersection

Postby ccdmas » Sun Dec 15, 2013 4:45 pm

Another one, this time waze took a left and a detour to come back and avoid a (perfectly allowed) right turn.

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 CBenson » Tue Dec 17, 2013 4:19 pm

Here is right/U/right with the unannounced U at a dead end. Raised here.
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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 ccdmas » Thu Dec 19, 2013 1:19 pm

Just so that it is noted: If I would post every instance of this issue cropping up literally everywhere here, I'd spent hours.

Just *ONE* more example out of dozens (albeit showing two totally seperate URs at the same spot)

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

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Re: why no left turn at intersection

Postby CBenson » Mon Dec 30, 2013 10:30 pm

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Re: why no left turn at intersection

Postby CBenson » Mon Jan 06, 2014 11:02 pm

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Re: why no left turn at intersection

Postby CBenson » Tue Jan 07, 2014 12:23 pm

Here is another odd avoidance of a left turn. I can't reproduce it so maybe it was based on unusually slow times to turn left.
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Re: why no left turn at intersection

Postby CBenson » Thu Jan 09, 2014 5:34 pm

Waze staff has stated that they are addressing the circumstance when historic data creates unreasonable routes to cut time. It is acknowledged that many times, Waze prefers to continue straight, make a u-turn and turn right instead of just turning left in the junction just to save a few seconds. Very often this is perceived as a mistake and not as a time saving.

Waze is testing changes to the routing that will prevent such detours if there is under a 30 sec difference between the routes.
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Re: why no left turn at intersection

Postby slandrum » Thu Jan 09, 2014 5:43 pm

Hopefully this is implemented soon. In the last couple days I've found at least a half dozen URs for this type of routing. It seems to be getting more and more frequent.
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Re: why no left turn at intersection

Postby bz2012 » Sat Jan 11, 2014 11:42 am

CBenson wrote:Waze staff has stated that they are addressing the circumstance when historic data creates unreasonable routes to cut time. It is acknowledged that many times, Waze prefers to continue straight, make a u-turn and turn right instead of just turning left in the junction just to save a few seconds. Very often this is perceived as a mistake and not as a time saving.

Waze is testing changes to the routing that will prevent such detours if there is under a 30 sec difference between the routes.

Thanks for taking the time to contact them about the problem.
Here is 'yet another example' of erroneous routing through a U turn rather than simply making a left turn.'
Imagehttps://www.waze.com/editor/?zoom=5&lat=30.44363&lon=-91.09093&env=usa&layers=TBFTFFTTTTFTTFTTTTTTTTTTTTTT
The 'faster' explanation often given makes no sense from the data we have available. Segment speeds for the avoided segment 15 m @ 36 kph vs the speeds for the 'recommended segments'
East Bound 33 m @ 22 kph, North Bound 10 m @ 32 kph, West Bound 31 m @ 3 kph. Clearly, the 'avoided path' should have been 'faster', based on total average segment travel times.

Perhaps the 'hidden data' on "wait time" would make it clear. It would be nice if the map editor displayed the wait time at the nodes involved at the time the UR was submitted.
Perhaps the User App could capture that information and pass it along so that it could be displayed along with the Problem Report.
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