why no left turn at intersection

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Re: why no left turn at intersection

Postby CBenson » Thu Dec 12, 2013 5:08 pm

Good question. I'm open to suggestions. I've been saying something along the lines of:

It appears that the waze routing algorithm is calculating that on average it is faster to make the right/U than it is to wait for the left turn signal. As this is a routing algorithm issue it can not be changed by the volunteer map editors that review the map update requests. For more information see http://www.waze.com/support.


I also note that I was routed the right/U shown here this again this morning. I took the right/U. It was not faster. There was a long line waiting to make the left, which I entirely bypassed. I made a right on red without delay and made the U with out delay. However, by the time I made it back to the intersection the left turners had the green and I had the red light. All the left turners made it through on that green. Only if you had to wait through more than one light cycle to make the left would the right/U be faster. Either the left turn would have the green when you first approach the intersection or if the left has the red you could make the right/U, but in this instance you hit the red when you get back to the intersection. I don't think waze takes this dynamic into consideration.
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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.
DERUR.png
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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.
DorseyL.png
DorseyL.png (441.87 KiB) Viewed 278 times

Location.
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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 CBenson » Mon Jan 27, 2014 4:15 pm

Here is what appears to be another example.
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Re: why no left turn at intersection

Postby CBenson » Thu Jan 30, 2014 5:56 pm

Another example is raised here.
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Re: why no left turn at intersection

Postby CBenson » Fri Jan 31, 2014 11:41 am

It seems to me those frontage roads cause all kinds of routing issues. Seems like they could warrant their own thread.
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Re: why no left turn at intersection

Postby CBenson » Tue Feb 11, 2014 3:13 pm

Another example is discussed here.
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