Another Odd Route

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Another Odd Route

Postby CBenson » Sun Mar 04, 2012 2:29 am

I know this intersection could be simplified. But why does waze route like this?
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Re: Another Odd Route

Postby CBenson » Sun Mar 04, 2012 2:39 am

This seems really odd to me. If I open the permalink to the live map that I gave above and then click the permalink again I get a new tab with the route. If I do this repeatedly I get bunch of tabs open with route highlighted. I currently have seven tabs open with the route. In three tabs the route is the correct left turn. In the other four the route is a right turn and then U-turn. The UR shows that the right and U is also used at least some of the time by the routing server when providing routes to the clients. But if waze can route through the left turn, why would it ever make the right and the U-turn? And why would I get different results when asking for the same route seconds apart?
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Re: Another Odd Route

Postby jasonh300 » Sun Mar 04, 2012 6:10 am

Traffic avoidance?

Not getting that behavior with the permalink right now though.
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Re: Another Odd Route

Postby CBenson » Sun Mar 04, 2012 11:58 am

jasonh300 wrote:Traffic avoidance?

I don't see how. Its not something that anyone is going to accept as good routing.

jasonh300 wrote:Not getting that behavior with the permalink right now though.
Nor am I this morning. Odd.
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Re: Another Odd Route

Postby jasonh300 » Sun Mar 04, 2012 2:56 pm

The only other thing I can suggest is that it was marked as a no-left-turn and at some point in the last...what? 40 days?...since we had a map update, someone else fixed it.
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Re: Another Odd Route

Postby CBenson » Mon Mar 05, 2012 1:56 am

If that's the case why would the live map give me a good route some of the time?
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Re: Another Odd Route

Postby jasonh300 » Mon Mar 05, 2012 2:15 am

CBenson wrote:If that's the case why would the live map give me a good route some of the time?


I have no clue. I was troubleshooting a route in Los Angeles yesterday and the route changed a couple of times over a period of about 10 minutes, but the road was turning red, indicating a traffic pileup.

Either that, or the map update has begun and that particular tile was updating while you were playing with it. But in that case, it wouldn't have switched back.
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Re: Another Odd Route

Postby CBenson » Mon Mar 05, 2012 3:35 pm

Live map is showing the left turn again for me now.

I'm seeing a decent number of these odd short deviations in the purple lines for UR requests. This result makes me think I shouldn't be ascribing them to "goodie munching." Although they do seem to be a routing problem, not a map problem, so I'm likely to close them as "not a problem." But I don't think simply getting rid of the "goodie munching" option is going to solve these problems.
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Re: Another Odd Route

Postby CBenson » Mon Mar 05, 2012 7:18 pm

Its back to the right and U now after the Live Map is showing the 2/12/12 update date.
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Re: Another Odd Route

Postby R4CLucky14 » Mon Mar 05, 2012 7:28 pm

Is it possible it's faster, if the left turn can only go on an arrow, and the arrow is short, then it could takes several minutes to take a left (I know an intersection where it takes over 90 seconds to get an arrow (and can only go on an arrow), but also takes 3 cycles to get through it if your in the back. )

If there is right on red, one could take a right if clear, then cross all the lanes, hang a u-turn, and go straight through the green light...
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