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Help to determine cause of unusual routing in New Hampshire

PostPosted: Mon Jan 22, 2018 2:32 pm
by Chronos74
Hello all, bringing this discussion from the NER discord #new-hampshire channel for more eyes on this. Access to the NER Discord server is through the form at: https://goo.gl/forms/X24ENSZ6ANw2sQpV2

We have a UR for incorrect routing in Candia, NH. The reporter was instructed to exit SR-101 at the Candia, NH exit and immediately get back on it. SR-101 is a limited access freeway in this part of the state. Original UR is: https://www.waze.com/en-US/editor?env=u ... st=7891618

We have confirmed the routing received via the live map, entering a starting point of Dover, NH and a destination of 20 Constitution Dr, Hudson, NH 03820. When SR-101 is not the preferred route, it instructs you to exit SR-101 in Candia. If you find a time where SR-101 is the preferred route, then you are not instructed to exit. Screenshot is below. Link to live map at 7:00am showing the detour off SR-101: https://www.waze.com/livemap?lon=-71.31 ... xt=07%3A00

[ img ]

PL for segments around that exit: https://www.waze.com/en-US/editor/?env= ... 2,88199551

Route Speeds info - A: -71.38749, 42.77614 and B: -70.874441, 43.183301 - usually the relevant route is Route 2, as most of the time the quickest route does not take SR-101.

From voludu2:
If I stick with 7 AM and experiment with the endpoint, then by the time I move it back close to where the blue and pink lines come together, I start getting the pink link on 101 but not taking the ramp detour.
If there were no such thing as BDP, or if we had done something to "break" BDP, I can't see a reason for waze to prefer the ramp detour.


We tried different times on live map, for example 7:00am and 7:30am, for 7:00am SR-101 was the second route and involved the detour, and for 7:30 101 was the first route and did not involve the detour.
[ img ]
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There was also a discussion about the Waze u-turn penalty, voludu2 says that there is no 3-segment u-turn penalty here.

Thanks in advance for any and all assistance!

-Dave

Re: Help to determine cause of unusual routing in New Hampsh

PostPosted: Mon Feb 12, 2018 12:36 am
by moogonk
Hi. I'm wondering if there are any other theories about this issue prior to our telling the reporter that we have no idea why this happened.

Any thoughts, please?

Re: Help to determine cause of unusual routing in New Hampsh

PostPosted: Mon Mar 05, 2018 5:19 pm
by Kartografer
A detour can be the second or third route. That doesn't indicate that the penalty is missing

Re: Help to determine cause of unusual routing in New Hampsh

PostPosted: Mon Mar 05, 2018 6:29 pm
by moogonk
Ok, but the reporter received the route as the first route, not the second or third.

Re: Help to determine cause of unusual routing in New Hampsh

PostPosted: Mon Mar 05, 2018 7:49 pm
by Kartografer
moogonk wrote:Ok, but the reporter received the route as the first route, not the second or third.

Right. I was trying to clarify, because if you can get the detour as the first route in LiveMap or in the app at a certain time, that makes it reproducible and testable. If not, it's not reproducible, so it's hard to explain.